Lesson 5 -7 Percent of Change

Definitions • Percent of Change- A ratio of change that compares the change in quantity to the original amount. • Percent of Increase- When the new amount is greater than the original. • Percent of Decrease- When the new amount is less than the original.

Example 1 Percent of Increase CLUBS: The Science Club had 25 members. Now it has 30 members. Find the percent of increase. = 0. 2 or 20%

Practice Problem Percent of Increase HOMES: The Nietos bought a house several years ago for $120, 000. This year, they sold it for $150, 000. Find the percent of increase. = 0. 25 or 25%

Example 2 Percent of Change Comic Books: Consuela had 20 comic books. She gave some to her friend. Now she has 13 comic books. Find the percent of change. State whether the percent f change is an increase or a decrease. = 0. 35 or 35% Since the new amount is less than the original, it is a percent of decrease.

Practice Problem Percent of Change SCHOOLS: Johnson Middle School had 240 students last year. This year, there are 192 students. Find the percent of change. State whether this percent of change is an increase or a decrease. = 0. 2 or 20% Since the new amount is less than the original, it is a percent of decrease.

Definitions • Markup - The increase in price. • Selling Price - Amount a customer pays for a product. • Discount - The amount a regular price is reduced.

Example 3 Find the Selling Price Marketing: Shonny is selling some embroidered jackets on a Web site. She wants to price the jackets 25% over her cost, which is $35. Find the selling price for a jacket. p = 1. 25(35) p = 43. 75 The selling price of the jacket is $43. 75

Practice Problem Find the Selling Price Markup: Shirts bought by a sporting goods store cost them $20 per shirt. They want to mark them up 40 percent. What will be the selling price? p = 1. 40(20) p = 28 The selling price of the shirt is $28

Example 4 Find the Sale Price The Sport Chalet is having a sale. Find the sale price of a snowskate that is 35% off the regular price of $95 p =. 65(95) p = 61. 75 The selling price of the snowskate is $61. 75

Practice Problem Find the Sale Price A computer usually sells for $1, 200. This week it is on sale for 30% off. What is the sale price? p =. 70(1200) p = 840 The selling price of the computer is $840