1. Warm Up 1. Find 30% of 40. 2. Find 28% of 60. 12 Solve for x.
5. 20 is what percent of 80?
6. 36 is what percent of 30? 12
16.8
0.44 38
25%
120%

2. Objective
Find percent increase and decrease.

3. A percent change is an increase or decrease given as a percent of the original amount. Percent increase describes an amount that has grown and percent decrease describes an amount that has be reduced.

4. Find each percent change
Find each percent change. Tell whether it is a percent increase or decrease.
From 8 to 10
8 to 10 is an increase, so a change from 8 to 10 is a 25% increase.

5. From 75 to 30
75 to 30 is a decrease, so a change from 75 to 30 is a 60% decrease.

6. From 200 to 110
200 to 110 is an decrease, so a change from 200 to 110 is a 60% decrease.

7. A. Find the result when 12 is increased by 50%.
12 increased by 50% is 18.
B. Find the result when 55 is decreased by 60%.
55 decreased by 60% is 22.

8. A. Find the result when 72 is increased by 25%.
72 increased by 25% is 90.
B. Find the result when 10 is decreased by 40%.
10 decreased by 40% is 6.

9. Common application of percent change are discounts and markups.
A discount is an amount by which an original price is reduced.
discount
= % of
original price
final price = –
A markup is an amount by which a wholesale price is increased.
final price =
wholesale cost
markup +
= % of

10. The entrance fee at an amusement park is $35
The entrance fee at an amusement park is $35. People over the age of 65 receive a 20% discount. What is the amount of the discount? How much do people over 65 pay?
The discount is $7. People over the age of 65 pay $28.00.

11. A student paid $31. 20 for art supplies that normally cost $52. 00
A student paid $31.20 for art supplies that normally cost $ Find the percent discount .
The discount is 40%

12. Ray paid $12 for a $15 T-shirt. What was the percent discount ?
The discount is 20%.

13. A video game has a 70% markup. The wholesale cost is $9
A video game has a 70% markup. The wholesale cost is $9. What is the selling price?
The amount of the markup is $6.30. The selling price is $15.30.

14. What is the percent markup on a car selling for $21,850 that had a wholesale cost of $9500?
The markup was 130 percent.

15. HW pp.  /16-40,50-61,64-77