1. Math 5-7: Percent of Change
Objective: How to find and use the percent of increase or decrease.

2. Vocabulary
percent of change – a ratio that compares the change in a quantity to the original amount
percent of increase – the percent of change when the new amount is greater than the original
percent of decrease – the percent of change when the new amount is less than the original
markup – the amount the price of an item is increased above the price the store paid for the item

3. Vocabulary selling price – the amount the customer pays for an item
discount – the amount by which a regular price is reduced

4. Percent of Change
find the amount of the change (subtract original and new)
find the ratio of that amount to the original amount
express it as a percent

5. Percent of Change original: 10 new: 6 (amount of change: 4)

6. Find the Selling Price
Method 1: find the amount of the markup, then add
Method 2: find the total percent

7. Find the Selling Price
suit: $200, 50% markup

8. Find the Sale Price
Method 1: find the amount of the discount, then subtract
Method 2: find the total percent

9. Find the Sale Price
shoes: $70, 10% discount

10. Examples
diamond ring: $470, 35% markup
sofa: $750, 35% off

11. Assignment
Pg. 239 (12-28e)
Chapter 5 TEST – 11/17