Lesson 7 MI/Vocab percent of change percent of increase percent of decrease Find percents of increase and decrease. Solve problems involving percents of.

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Lesson 7 MI/Vocab percent of change percent of increase percent of decrease Find percents of increase and decrease. Solve problems involving percents of change.

Lesson 7 Ex1 Find Percent of Change A. State whether the percent of change is a percent of increase or a percent of decrease. Then find the percent of change. original: 32 new: 40 Find the amount of change. Since the new amount is greater than the original, the percent of change is a percent of increase. 40 – 32 = 8

Lesson 7 Ex1 Find Percent of Change Find the percent using the original number, 32, as the base. Answer: The percent of increase is 25%. change original amount percent of change 100 percent 8(100)= 32(r)Find the cross products. 800= 32rSimplify. Divide each side by = rSimplify.

Lesson 7 Ex1 Find Percent of Change B. State whether the percent of change is a percent of increase or a percent of decrease. Then find the percent of change. original: 20 new: 4 Find the amount of change. Since the new amount is less than the original, the percent of change is a percent of decrease. 20 – 4 = 16

Lesson 7 Ex1 Find Percent of Change Find the percent using the original number, 20, as the base. Answer: The percent of decrease is 80%. change original amount percent of change 100 percent 16(100)= 20(r)Find the cross products. 1600= 20rSimplify. Divide each side by = rSimplify.

A.A B.B C.C D.D Lesson 7 CYP1 A.Increase of 10% B.Decrease of 10% C.Increase of 90% D.Decrease of 90% A. State 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.A B.B C.C D.D Lesson 7 CYP1 A.Increase of 300% B.Decrease of 300% C.Increase of 25% D.Decrease if 25% B. State 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

Lesson 7 Ex2 SALES The price a used-book store pays to buy a book is $5. The store sells the book for 28% above the price that it pays for the book. What is the selling price of the $5 book? Let s = the selling price of the book. Since 28% is the percent of increase, the amount the used-book store pays to buy a book is less than the selling price. Therefore, s – 5 represents the amount of change. Find the Missing Value change book store cost percent of change 100 percent

Lesson 7 Ex2 (s – 5)(100) = 5(28)Find the cross products. 100s – 500 = 140Distributive Property 100s – = Add 500 to each side. 100s = 640Simplify. Answer: The selling price of the $5 book is $6.40. Find the Missing Value Divide each side by 100. s = 6.4Simplify.

Lesson 7 CYP2 1.A 2.B 3.C 4.D A.$38.00 B.$31.72 C.$25.00 D.$27.72 At one store the price of a pair of jeans is $ At another store the same pair of jeans has a price that is 22% higher. What is the price of jeans at the second store?

Lesson 7 Ex3 SALES TAX A meal for two at a restaurant costs $ If the sales tax is 5%, what is the total price of the meal? The tax is 5% of the price of the meal. 5% of $32.75 = 0.05 × % = × = Use a calculator. Round $ to $1.64. Add this amount to the original price. $ $1.64 = $34.39 Answer: The total price of the meal is $34.39.

1.A 2.B 3.C 4.D Lesson 7 CYP3 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?

Lesson 7 Ex4 DISCOUNT A dog toy is on sale for 20% off the original price. If the original price of the toy is $3.80, what is the discounted price? The discount is 20% of the original price. 20% of $3.80 = 0.20 × % = × 3.80 = 0.76 Subtract $0.76 from the original price. $3.80 – $0.76 = $3.04 Answer: The discounted price of the dog toy is $3.04.

A.A B.B C.C D.D Lesson 7 CYP4 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?