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 Percent of Change – the ratio of the change in an amount to the original amount expressed as a percent.  Percent of Increase – the new number is greater.

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Presentation on theme: " Percent of Change – the ratio of the change in an amount to the original amount expressed as a percent.  Percent of Increase – the new number is greater."— Presentation transcript:

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2  Percent of Change – the ratio of the change in an amount to the original amount expressed as a percent.  Percent of Increase – the new number is greater than the original number.  Percent of Decrease – the new number is less than the original number.

3 1. Decide if there is an increase or decrease. 2. Subtract the original amount and the new amount. 3. Divide by the original amount. 4. Turn your answer into a percent.

4 Determine whether the change is an increase or a decrease and find the percent of change. Original amount: 20 New amount: 9 The amount went down so it is a decrease. 20 - 9 = 11 11 ÷ 20 = 0.55 55% decrease

5 Determine whether the change is an increase or a decrease and find the percent of change. 1. Original: 20New: 23 15% increase 2. Original: 25New: 17 32% decrease 3. Original: 32New: 40 25% increase

6 A.increase of 10% B.decrease of 10% C.increase of 90% D.decrease of 90% Determine whether the percent of change is a percent of increase or a percent of decrease. Then find the percent of change. original: 20 new: 18

7 A.increase of 300% B.decrease of 300% C.increase of 25% D.decrease of 25% Determine whether the percent of change is a percent of increase or a percent of decrease. Then find the percent of change. original: 12 new: 48

8  Page 121 #1-4

9 1. How much tax will you pay on a pair of shoes that cost $36 if the tax rate is 6%? $2.16 2. If a salesperson earns 30% commission on all sales, how much will he earn for a sale of $4500? $1350 3. What will the total cost be for a purchase of $54, if you have to pay 7% sales tax? $57.78

10 4. Tyrell qualifies for a 20% discount on his car insurance. If his payment is $85 without a discount, what will his new payment be? $68 5. A dog toy is on sale for 20% off the original price. If the original price is $3.80, what is the discounted price? $3.04

11 A.$64.27 B.$100.00 C.$76.74 D.$74.71 A portable CD player costs $69.99. If the sales tax is 6.75%, what is the total price of the CD player?

12 A.$9.99 B.$4.99 C.$16.99 D.$34.99 A baseball cap is on sale for 15% off the original price. If the original price of the cap is $19.99, what is the discounted price?

13  Page 121 #6-13

14  Page 122 #14-20 even #24-38 even

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