Algebra 2.10
Algebra 2.10Percent Increase and DecreaseLearning
TargetsLanguage GoalStudents will be able to verbally express
percent increase and decrease.
Math GoalStudents will be able to find percent increase and
decrease.
Essential QuestionWhat are instances where you may encounter
both percent increase and decrease?
Warm-up
Homework Check
Homework Check
5Homework Check
Homework Check
VocabularyPercent Change: an increase or decrease given as a
percent of the original amount.Percent Increase: an increase given
as a percent of the original amount.Percent Decrease: an decrease
given as a percent of the original amount.VocabularyDiscount: an
amount by which an original price is reduced.Markup: the amount by
which a wholesale cost is increased.
Example 1: Finding Percent Increase or DecreaseFind each percent
change. Tell whether it is a percent increase or decrease.A. From
25 to 49B. from 50 to 45
C. from 200 to 110
Example 2: Finding the Result of a Percent Increase or
DecreaseFind the result when 30 is increased by 20%.
Find the result when 65 is decreased by 80%.Example 3:
DiscountsDiscount = % of original priceFinal price = original price
discount
Markup = % of wholesale costFinal price = wholesale cost +
markup
Example 3: DiscountsA. Admissions to the museum is $8. Students
receive a 15% discount. How much is the discount? How much do
students pay?Method 1:
Method 2:
Example 3: DiscountsB. Christo used a coupon and paid $7.35 for
a pizza that normally costs $10.50. Find the percent discount.
Example 3: DiscountsC. A $220 bicycle was on sale for 60% off.
Find the sale price.
Example 3: DiscountsD. Ray paid $12 for a $15 T-shirt. What was
the percent discount?
Example 4: MarkupsA. Kaleb buys necklaces at wholesale cost of
$48 each. He then marks up the price by 75% and sells the
necklaces. What is the amount of the markup? What is the selling
price?Method 1:
Method 2:
Example 4: MarkupsB. Lars purchased a daily planner for $32. The
wholesale cost was $25. What was the percent markup?
Extra Practice
Extra Practice
Extra Practice
Extra Practice
Extra Practice
Extra Practice
Extra Practice
Lesson Quiz
