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Percent of Change We can find percents of increase and decrease and solve problems involving percents of change.

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Vocabulary Percent of change: an increase or decrease expressed at 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.

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Percent of Change Formula

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Ex. 1: State whether each percent of change is a percent of decrease or increase. Then find the percent of change. 1. original: 32 new: 40 2. original: 20 new: 4

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You TRY!!!! 3. original: 72 new: 36 4. original: 45 new: 50

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Ex. 2: Find the missing value. 1. 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?

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Ex. 3: Find the total price of each item. 1. Software: $39.50 Sales tax: 6.5% 2. Compact disc: $15.99 sales tax: 5.75%

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Ex. 4: Find the discounted price of each item. 1. jeans: $45.00 discount: 25% 2. book: $19.95 discount: 33%

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Ex. 5: Find the final price of each 1. lamp: $120.00 discount: 20% tax: 6% 2. camera: $58.00 discount: 25% tax: 6.5%

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Application 1. In 1987, the United States had 2 million active-duty military personnel. By 2000, there were only 1.4 million active-duty military personnel. What was the percent of decrease?

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2. In order for a food to marked “reduced fat,” it must have at least 25% less fat than the same full-fat food. If one ounce of reduced fat chips has 6 grams of fat, what is the least amount of fat in one ounce of regular chips?

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