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7/28/2019 Decision tree and decision analysis
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ASIGNMENT NO: 1
Name: Mohammad Abdullah
Enrollment: 2010-E-37
Class: MBA (5th quarter)
Course: Quantitative Analysis.
Topic: Decision Analysis...
Submitted To: Mr. Taimoor Shah
Submission Date: 21-06-2012
INSTITUTE OF MANAGEMENT SCIENCES UNIVERSITY OF
BALUSHISTAN QUETTA
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Question No: 2
Finance manger's optimal policy would be Drill upto 20 meters because it has the lowest expected cost
No water P= 0.8$ 275 000
$ 125 000
1
2
Water Struck P= 0.2
Do not Drill
Drill upto 25
Drill upto 20 meter
Do not drill
No water P= 0.30
Water struck P= 0.70
$100,000
2n
1st
Cost = 245 000$ 150,000
$ 250,000
$ 245,000
Cost = $ 77,500
$ 77,500
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Problem No: 3-27
a. Decision Table.
State of nature/ activity
Size of first stationGoodmarket($)
Fairmarket($)
PoorMarket($)
Small$
50,000.00$
200,000.00$
(10,000.00)
medium$
80,000.00$
30,000.00$
(20,000.00)
large$
100,000.00$
30,000.00$
(40,000.00)
very large$
300,000.00$
25,000.00$
(160,000.00)
b. Optimistic decision criterion Maximax.
Maximax = {Max in 1st row,Max in 2nd row,Max in 3rd row,Max in 4th row} = {Max}
Maximax = {200000,80000,100000,300000} = {300000}
Conclusion: Optimal decision is to build a very large size first station.
c. Passimistic decision criterion (Maximin).
Maximin = {-10000, -20000, -40000, -160000} = {-10000}
Conclusion: Passimistic decision Is to build a small size of first station.
d. Equallly likely decision criterion (Laplace).
Small 50000+20000+(-10000)/3=60000/3=20000
medium 80000+30000+(-20000)/3=90000/3=30000
large 100000+30000+(-40000)/3=90000/30=30000
very large 300000+25000+(-160000)/3=165000/3=55000
Laplace={20000,30000,30000,55000}={55000}
Conclusion: Equally likely decision is to build a Very large size of f irst station.
e. Realism decision criterion (Hurwicz). a = 0.8
Hurwicz={Max in row x + Min in row (1-)}
Small = {200000 x 0.8 = (1- 0.8) (-10000)} = 158000
Medium = {80000 x 0.8 = (1- 0.8) (-20000)} = 60000
Large = {100000 x 0.8 = (1- 0.8) (-40000)} = 72000
Very large = {300000 x 0.8 = (1- 0.8) (-160000)} = 208000
Hurwicz={158000,60000,72000,208000} = {208000}
Conclusion: Laplace decision Is to build a Very large size of first station.
f. Loss Table
State of nature/ activity
Size of first stationGoodmarket($)
Fairmarket($)
PoorMarket($)
Small$
250,000.00$
10,000.00$
10,000.00
medium$
220,000.00 $ -$
20,000.00
large
$
200,000.00 $ -
$
40,000.00
very large $ - $ $
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5,000.00 160,000.00
g. Minimax Regret decision criterion.
Minimax={250000,220000,200000,160000} = {160000}
Conclusion: Minimax regret decision Is to build a Very large size of first station.
Question No: 2
1st decision pay off tableDecision alternatives state of nature /activity
highdemand
lowdemand
Expand small plant 2.5 m (-3.1 m)
Do not expand small plant 1.5 m 1.1 m
Probability 0.85 0.15
Last decision pay off table
Decision alternatives state of nature /activityhighdemand
lowdemand
construct full size pland 5 m (-2 m)construct small size plant 1.66 m 1 m
Probability 0.85 0.15
Full size plant high demand
cost = 5 million
payoff =1million/annum
period = 10 years
Net pay off = {(1 x 10)} - {5}
10 - 5 = $ 5 million
Full size plant low demand
cost = 5 million
payoff = 0.3 million/annum
period = 10 years
Net pay off ={(0.3 x 10)} -{5}
3 - 5 = $ -2 million
Expanded small plant high demand
cost = $ 1 million
expansion cost = $ 4.2 million
High demand yeild = $ 0.25 million/annumHigh demad period = 2 years
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expanded high demand yeild = $ 0.9 million/ annum
expanded high demand Period = 8 years
Net pay off ={(0.25 x 2 + 0.9 x 8)} - {1+4.2}
7.7 - 5.2 = $ 2.5 million
Expanded small plant low demand
cost = $ 1 million
expansion cost = $ 4.2 million
High demand yeild = $ 0.25 million/annum
High demad period = 2 years
expanded low demand yeild = $ 0.2 million/ annum
expanded low demand Period = 8 years
Net pay off = {(0.25 x 2 + 0.2 x 8)} - {1 + 4.2}
7.7 - 5.2 = $ -3.1 million
Do not expand small plant high demand
cost = 1 million
High demand yeild = 0.25 million/annumHigh demad period = 10 years
Net pay off = {(0.25 x 2 + 0.25 x 8)} - {1}
2.5 - 1 = $ 1.5 million
Do not expand small plant low demand
cost = $ 1 million
High demand yeild = $ 0.25 million/annum
High demad period = 2 years
Low demad yield = $ 0.2 million/ annum
Low demad Period = 8 years
Net pay off = {(0.25 x 2 + 0.2 x 8)} - {1}
2.1 - 1 = $ 1.1 million
Small plant low demand
cost = $ 1 million
Payoff = $ 0.2 million/annum
High demad period = 2 years
Period = 10 years
Net pay off ={(0.2 x 10)} -{1}
2 - 1 = $ 1 million
Decision Table
EMV AT Nod- 4 = {(0.85 x 2.5 ) + (0.15 x -3.1)} = {$ 1.66 million}
EMV AT Nod- 3 = {(0.85 x 1.5 ) + (0.15 x 1.1)} = {$ 1.44 million}
EMV AT Nod- 2 = {(0.85 x 5 ) + (0.15 x -2)} = {$ 3.95 million}
EMV AT Nod- 1 = {(0.85 x 1.66 ) + (0.15 x 1)} = {$ 1.56 million}
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Question No: 2
No water struck
Out source cost = Rs. 150000
Drilling cost = Rs. 5000/meter
Drill upto 25 meters Cost=(25 merters x Rs. 5000) + 150,000 = Rs.275,000
Water struck
Drilling cost =Rs.5000/meter
Drill upto 25 meters Cost= 25 merters x Rs. 5000 = Rs. 125,000
Do not drill further
Outsource cost= Rs.150,000
Drilling cost = Rs. 5000/meter
Drill upto 20 meters= (Rs. 5000/meter x 20 Meters) + Rs. 150,000 =Rs. 250,000
Water struck at 20 meters P= 0.70
Drilling cost = Rs. 5000/meter
Drill upto 20 meters= (Rs. 5000/meter x 20 Meters) = Rs. 100,000
Do not drill any well
Out source cost= Rs. 150,000
Analysis Table
Expected cost AT Node 2 = (275,000 x 0.8) + (125,000 x 0.2) = Rs. 245,000
Decision at the decision point 2= Is to drill upto 25 meters i.e Rs. 245,000
Expected cost AT Node 1 = (25,000 x 0.3) + (100,000 x 0.7) = Rs. 77,500Decision at the decision point 1= Is to drill upto 20 meters i.e Rs. 77,500
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The optimal policy would be to construct full size plant because it has the highiest ecpected monitory value
High demand P=$ 2.5 Million
$ -3.1 Million
2
1
3
4
$ 1.5 Million
$ 1.1 Million
Low demand P= 0.15
High demand P=
Low demand P= 0.15
Do not Expand Small Plant
Expand Small Plant
Construct Small size
Construct Full size
High demand P=
High demand P= 0.85
Low demand P= 0.15
Low demand P= 0.15
$ 5 Million
$ -2 Million
$1 Million
$ 1.66 Million
2n
1st
EMV = $ 1.66 Million
EMV = $ 1.44 Million
$ 3.95 Million
EMV= $ 1.56 Million
EMV= $ 3.95 Million
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Problem 1
page 225
D= 2500 units
C = $ 110/unit
F = $16/ orderr = 0.20/$/year
Cr = $ 22/unit/year
a.
Q * = 2 D f/Cr
Q * = 2 (2500) (16) / 22
Q * = 60.3022 units / order
b. Tc = Toc + Tcc
Tc = F(D/Q) + Cr(Q/2)
Tc = 16(2500/60.3022) + 22(60.3022/2)
Tc = 663.347 + 663.242
Tc = $ 1326.6321/year
c. Q * = 60 units rounded of to the nearest
Tc = F(D/Q) + Cr(Q/2)
Tc = 16(2500/60) + 22(60/2)
Tc = 666.67 + 660
Tc = $ 1326.67/year
%age increase = 1326.67 / 1326.6321 x 100 = 100.0028568 % = 0.0028568 %
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`
Problem 2
Q * = 60.3022 units / order
50 % above Q * = 90.4533 units / order
Tc prior = $ 1326.6321/year
Tc = F(D/Q) + Cr(Q/2)
Tc = 16(2500/90.4533) + 22(90.4533/2)
Tc = 442.2171 + 994.9863
Tc = $ 1437.2034/year
%age increase = 1437.2034 / 1326.6321 x 100 = 108.3347 % = 8.3347 %
Problem 3
(a) Ordering 10 % above than EOQ = 66.3324 units / order
Tc = F(D/Q) + Cr(Q/2)
Tc = 16(2500/66.3324) + 22(66.3324/2)
Tc = 603.0233 + 729.6566
Tc = $ 1332.6799/year
%age increase = 1332.6799 / 1326.6321 x 100 = 100.45587% = 0.45587 %
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(b) Ordering 10 % less than EOQ = 54.2719 units / order
Tc = F(D/Q) + Cr(Q/2)
Tc = 16(2500/54.2719) + 22(54.2719/2)
Tc = 737.0285 + 596.9900
Tc = $ 1334.020353/year
%age increase = 1334.020353 / 1326.6321 x 100 = 100.55968 % = 0.55968 %
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Problem 6-37
N * = 5 orders/year
F = $6/order
Cr = $ 10 / grill / year
Stockout Cost = $ 50 unit
Current ROP = 650 units
L = 12 days
Probabilities = 0.3 0.2 0.1 0.1 0.05 0.05 0.05 0.05 0.05 0.03 0.02
Alternatives Demand during lead time600 650 700 750 800 850 900 950 1000 1050 1100 EMV
600 0 12500 25000 37500 50000 62500 75000 87500 100000 112500 125000 33375
650 500 0 12500 25000 37500 50000 62500 75000 87500 100000 112500 24775
700 1000 500 0 12500 25000 37500 50000 62500 75000 87500 100000 18775
750 1500 1000 500 0 12500 25000 37500 50000 62500 75000 87500 17075
800 2000 1500 1000 500 0 12500 25000 37500 50000 62500 75000 10675
850 2500 2000 1500 1000 500 0 12500 25000 37500 50000 62500 7925
900 3000 2500 2000 1500 1000 500 0 12500 25000 37500 62500 6075
950 3500 3000 2500 2000 1500 1000 500 0 12500 25000 37500 4375
1000 4000 3500 3000 2500 2000 1500 1000 500 0 12500 25000 3575
1050 4500 4000 3500 3000 2500 2000 1500 1000 500 0 12500 3425
1100 5000 4500 4000 3500 3000 2500 2000 1500 1000 500 0 3665
Home Inc... should maintain safety stock level of inventory of 1050 units
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Exercise :3
P = 10,000 units / year
C = $ 1.5/unit
F = $ 500/ order
r = 0.25/$/year
Cr = $ 0.375/unit/year
(a) D = 1800 units / year
Q * = 2 D f/Cr(1-D/P)
Q * = 2 (1800) (500) /(0.375)(1-1800/10000)
Q * = 2419.4335 units / order
Tc = Toc + Tcc
Tc = F(D/Q) + Cr(Q/2)(1-D/P)
Tc = 500 (1800/2419.43) + 0.375 (2419.43/2)(1-1800 / 10000)
Tc = 371.98 + 371.98
Tc = $ 737.96/year
(b) D = 7200 units / year
Q * = 2 D f/Cr(1-D/P)
Q * = 2 (7200) (500) /(0.375)(1-7200/10000)
Q * = 8280.7867 units / order
Tc = Toc + Tcc
Tc = F(D/Q) + Cr(Q/2)(1-D/P)
Tc = 500 (7200/8280.7867) + 0.375 (8280.7867/2)(1-7200 / 10000)
Tc = 434.7413 + 434.7413
Tc = $ 869.4826 /year
If ordered four fold than the last year's Q * = 9677.734 units / order
Tc = Toc + Tcc
Tc = F(D/Q) + Cr(Q/2)(1-D/P)
Tc = 500 (7200/9677.734) + 0.375 (9677.734/2)(1-7200 / 10000)
Tc = 371.9879 + 1487.9516
Tc = $ 1859.9395 /year
Q * 9677.734 Total Cost = $ 1859.9395
Q * 8280.786 Total Cost = $ 869.4826
Difference due to four fold = $ 990.4569
Note: This difference is due to increasing the order size exactly by the factor of 4.
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Insufficient order will lead to additional holding cost.
Production manager should increase her order size by the factor of 3 and
she should order 8280.7867 units / order.
Exercise: 6
Page 241
D = 16,000 Ounce
r = 0.10 / $ / year
(a)Table6.7
Vendeor Unit Cost/Ounce $ OrderingCost $ Term of Sales
1 6.1 30 Q >= 1,600
2 6.3 25 Q >= 1,200
3 5.9 27 Q >= 1,800
EOQ for 3rd region:
Q * = 2 D F / Cnr
Q * = 2 (16000) (27) /5.90 x 0.10
Q * = 1210.1267 units
Since Q * do not luy in the 3rd region there fore we will take the lowe limitof
the 3rd region for the calculation of Total cost.
Tc = F(D/Q) + Cnr(Q/2) + DCn
Tc = 27 (16000 / 1800) + 0.59 (1800/2) + (16000 x 5.90)
Tc = 240 + 537 + 94400
Tc = $ 95177 / year
EOQ for 2nd region:
Q * = 2 D F / Cnr
Q * = 2 (16000) (25) / 6.30 x 0.10
Q * = 1126.8723 units
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Since Q * do not luy in the 2nd region there fore we will take the lowe limitof
the 2nd region for the calculation of Total cost.
Tc = F(D/Q) + Cnr(Q/2) + DCn
Tc = 25 (16000 / 1200) + 0.63 (1200/2) + (16000 x 6.30)
Tc = 333.3333 + 378 + 100800
Tc = $ 101511.3333 / year
EOQ for 1st region:
Q * = 2 D F / Cnr
Q * = 2 (16000) (30) / 6.1 x 0.10
Q * = 1254.50 units
Since Q * is not luying in the 1st region there fore we will take lower
limit of 1st region For calculation of Tc.
Tc = F(D/Q) + Cnr(Q/2) + DCn
Tc = 30 (16000 / 1600) + 0.61 (1600/2) + (16000 x 6.10)
Tc = 300 + 488 + 97600
Tc = $ 98,388 / year
VendeorTerm ofSales
Minimumcost
3 Q >= 1,800$
95,177
2 Q >= 1,200$
101,511
1 Q >= 1,600$
98,388
Sandia should purchase from 3rd Vendor because it has the lowest Tc.
(b) Optimal inventory policy
L = 5 days
w.d = 250 days
T * = Q / D x w.d
T * = 1600 / 16000 x 250
T * = 25 days
N * = D / Q
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N * = 16000 / 1600
N * = 10 orders / year
ROP = L x Daily demand
ROP = 5 x 64
ROP = 320 units
Problem: 1
page 225
C = $ 200/unit
F = $ 11 / order
r = 0.13/$/year
Cr = $ 26/unit/year
D = 50 units / month = 600 units / year
L = 7days (1 + 1 + 3 + 2)
w.d = 350 days / year(a) Q * = 2 D f/Cr
Q * = 2 (600) (11) / 26
Q * = 22.5320 units / order
(b,c,d)
Tc = Toc + Tcc
Tc = F(D/Q) + Cr(Q/2)
Tc = 11 (600/22.5320) + 26 (22.5320/2)
Tc = 292.9167 + 292.9160
Tc = $ 585.8327/year
(e) Optimal inventory policy
Q * = 22.5320 units / order
T * = Q * / D x w.d
T * = 22.5320 / 600 x 350
T * = 13.14 or 13 days
N * = D / Q*
N * = 600 / 22.5320
N * = 26.63 of 27 orders
ROP = L x Daily demand
ROP = 7 x 600 / 350 = 12 days
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(Inventory level units)
Q * = 23 units
Average Inventory
ROP = 12 units
(Continue = 27 Orders)
(Time = 300 days)
7 days 13 days
page 219
Problem 1
(a) C = $ 110 /unit
F = $ 5 / order
r = 0.12/$/year
Cr = $ 13.2/unit/yearD = 6 units / month = 72 units / year
w.d = 300 days / year
(b)
Q TOC TCC TC
1 360 6.6 366.6
2 180 13.2 193.2
3 120 19.8 139.8
4 90 26.4 116.4
5 72 33 105
6 60 39.6 99.6
7 51 46.2 97.28 45 52.8 97.8
9 40 59.4 99.4
10 36 66 102
page 215
Problem 1 Q * = 2 D f/Cr
Q * = 2 (72) (5) / 13.2
Q * = 7.3854 units / order
Problem 2 Tc = Toc + Tcc
Tc = F(D/Q) + Cr(Q/2)Tc = 5 (72/7.3854) + 13.2 (7.3854/2)
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Tc = 48.7448 + 48.7436
Tc = $ 97.4884/year
Yes our answer matching with previous answer.
Problem 3
D = 24 units / month = 288 units / yearQ * = 2 D f/Cr
Q * = 2 (288) (5) / 13.2
Q * = 14.7709 units / order
Selly should not increase her order quantity by factor of 4.
She should increase her order quantity be factor of 2.
Optimal inventory policy
Q * = 14.7709 units / order
T * = Q * / D x w.d
T * = 14.7709 / 288 x 300
T * = 15.3864 or 15 days
N * = D / Q*
N * = 288 / 14.7709
N * = 16.2062 of 16 orders / year
Exercise 4
C = $ 450 / unit
F = $ 50 / order
r = 0.25 / $ / year
Cr = $ 112.5 / unit / year
D = 90 units / year
L = 10 days
w.d = 270 days / year
(a) Q * = 2 D F / Cr
Q * = 2 (90) (50) / 112.5
Q * =8.9442 units
M * = 2 D F / Cr
M * = 2 (90) (50) / 112.5
M * =8.9442
M * = 2.0902 units / order
m = Q * - M *
m = 8.9442 - 8.9442
m = 0 units%age of EOQ met by M * = M * / Q* x 100
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%age of EOQ met by M * = 8.9442 / 8.9442 x 100
%age of EOQ met by M * = 100 %
%age of EOQ met by m = m / Q* x 100
%age of EOQ met by m = m / Q* x 100
T * = Q * / d x w.d
T * = 38.5695 / 90 x 270
T * = 115.7085 or 116 days
N * = D / Q *
N * = 90 / 38.2695
N * = 2.3517 or 2 orders
ROP = L x daily demand
ROP = 10 x 90 /270
ROP = 3.3333 units
Tc = F(D/Q) + CrM2 / 2Q + b (Q - M ) 2 /2Q
Tc = 50(90/38.2695) +112.5(2.0902) 2/ 2 (38.2695) +6.5 (38.2695 - 2.0902 ) 2 /2(38.2695)
Tc = 117.5871 + 6.4216 + 111.1606
Tc = 117.5871 +117.5822
Tc = $ 235.1693
Tc = 117.5871 +117.5822
Tc = $ 235.1693
Tc = 117.5871 +117.5822
Tc = $ 235.1693
(b) C = $ 450 / unit
F = $ 50 / order
r = 0.25 / $ / year
Cr = $ 112.5 / unit / year
D = 90 units / year
L = 10 days
w.d = 270 days / yearb = $ 5 + Promotional $ 135 / 90 = $ 6.5 / unit
Q * = 2 D F / Cr x b + Cr / b
Q * = 2 (90) (50) / 112.5 x 6.5 + 112.5 / 6.5
Q * =8.9442 units x 4.2787 units
Q * = 38.2695 units / order
M * = 2 D F / Cr x b / b + Cr
M * = 2 (90) (50) / 112.5 x 6.5 / 6.5 + 112.5
M * =8.9442 x 0.2337
M * = 2.0902 units / order
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m = Q * - M *
m = 38.2695 - 2.0902
m = 36.1793 units
%age of EOQ met by M * = M * / Q* x 100
%age of EOQ met by M * = 2.08 / 38.25 x 100%age of EOQ met by M * = 5.4617 %
%age of EOQ met by m = m / Q* x 100
%age of EOQ met by m = 36.1793 / 38.5695 x 100
%age of EOQ met by m = 94.5382 %
T * = Q * / d x w.d
T * = 38.5695 / 90 x 270
T * = 115.7085 or 116 days
N * = D / Q *
N * = 90 / 38.2695
N * = 2.3517 or 2 orders
ROP = L x daily demand
ROP = 10 x 90 /270
ROP = 3.3333 units
Tc = F(D/Q) + CrM2 / 2Q + b (Q - M ) 2 /2Q
Tc = 50(90/38.2695) +112.5(2.0902)2/ 2 (38.2695)+6.5 (38.2695 - 2.0902 )
2/2(38.2695)
Tc = 117.5871 + 6.4216 + 111.1606
Tc = 117.5871 +117.5822
Tc = $ 235.1693
(c..) C = $ 450 / unit
F = $ 50 / order
r = 0.25 / $ / year
Cr = $ 112.5 / unit / yearD = 90 units / year
L = 10 days
w.d = 270 days / year
b = $ 5
Q * = 2 D F / Cr x b + Cr / b
Q * = 2 (90) (50) / 112.5 x 5 + 112.5 / 5
Q * =8.9442 units x 4.8476 units
Q * = 43.3586 units / order
M * = 2 D F / Cr x b / b + Cr
M * = 2 (90) (50) / 112.5 x 5 / 5 + 112.5
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M * =8.9442 x 0.205684
M * = 1.8450 units / order
m = Q * - M *
m = 43.3586 - 1.8450
m = 41.5135 units%age of EOQ met by M * = M * / Q* x 100
%age of EOQ met by M * = 1.8450 / 43.3856 x 100
%age of EOQ met by M * = 4.2525 %
%age of EOQ met by m = m / Q* x 100
%age of EOQ met by m = 41.5135 / 43.3856 x 100
%age of EOQ met by m = 95.6849 %
T * = Q * / d x w.d
T * = 43.3856 / 90 x 270
T * = 130.1568 or 130 days
N * = D / Q *
N * = 90 / 43.3856
N * = 2.0744 or 2 orders
ROP = L x daily demand
ROP = 10 x 90 /270
ROP = 3.3333 units
Tc = F(D/Q) + CrM2 / 2Q + b (Q - M ) 2 /2Q
Tc = 50(90/43.3856) +112.5(1.8450) 2 / 2 (43.3856) + 5 (43.3856 - 1.8450 ) 2 /2(43.3856)
Tc = 103.7210 + 4.4133 + 99.4351
Tc = 103.7210 +103.8484
Tc = $ 207.5694 / year
Tabulated Comparison
S # Particularsa. No
Backorder
b. withadditional
$ 6.5
c. $5without
additional
1 Q * 8.9442 38.2695 93.3586
2 M * 8.9442 2.0902 1.8453 m 0 36.1793 41.5135
4 M * %age 100% 5.46% 4.25%
5 m %age 0% 94.54% 95.68%
6 Toc 117.5871 117.5871 103.721
7 Tcc 117.5822 117.5822 103.8484
8 Tc 235.1693 235.1693 207.5694
9 N * 2.3517 2.3517 2.0744
10 T * 115.7085 115.7085 130.1568
11 ROP 3.3333 3.3333 3.3333