2-7 Notes for Algebra 1 Percent of Change.

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Presentation transcript:

2-7 Notes for Algebra 1 Percent of Change

Percent of Change Is the ratio of change in an amount to the original amount expressed as a percent.

Percent of Increase A percent of change when the new number is greater than the original number.

Percent of Decrease A percent of change when the new number is less than the original number.

Example 1 pg. 119 Percent of Change Determine whether each percent of change is a percent of increase or a percent of decrease. Then find the percent of change. 1.) Original: 32 2.) Original: 20 New: 40 New: 4

Example 1 pg. 119 Percent of Change Determine whether each percent of change is a percent of increase or a percent of decrease. Then find the percent of change. 1.) Original: 32 2.) Original: 20 New: 40 New: 4 percent of increase; 25% percent of decrease; 80%

Example 2 pg. 120 Real World Example 2.) 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 book?

Example 2 pg. 120 Real World Example 2.) 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 book? $6.40

Example 3 pg. 120 Sales Tax 1.) SALES TAX A meal for two at a restaurant costs $32.75. If the sales tax is 5%, what is the total price of the meal?

Example 3 pg. 120 Sales Tax 1.) SALES TAX A meal for two at a restaurant costs $32.75. If the sales tax is 5%, what is the total price of the meal? $34.39

Example 4 pg. 121 Discounts 1.) 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?

Example 4 pg. 121 Discounts 1.) 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? $3.04

2-7 pg. 122 15-35o, 36-44, 51-72(x3)