 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 transcript:

 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.

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.

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 = % decrease

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

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

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

 Page 121 #1-4

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

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

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

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?

 Page 121 #6-13

 Page 122 #14-20 even #24-38 even