2. The percent of a quantity increases or decreases from its original amount. To find the percent of change, use these two steps. Step 1: Subtract to find the amount of change. Step 2: Use the proportion amount of change original amount = percent of change 100

3. Northern Carolina had 12 seats in the U.S. House of Representatives in the 1990’s. After the 2000 census, Northern Carolina had 13 seats. Find the percent of increase in the number of representatives. Find the amount of change by subtracting Write a proportion Find the cross product Simplify

4. In 2000, California went from 52 to 53 representatives. Find the percent of increase for California. Find the amount of change by subtracting Write a proportion Find the cross product Simplify

5. To make a profit, stores charge more for merchandise than they pay for it. The difference between the selling price and the original cost, or the store’s cost, of an item is called the markup. The percent of increase is the percent of markup. amount of markup original cost = percent of markup 100 To find a percent of markup, you use the proportion below.

6. An electronics store orders sets of walkie-talkies for $14.85 each. The store sells each set for $19.90. What is the percent of markup. Find the amount of markup by subtracting Write a proportion Find the cross product Simplify

7. Find the percent of markup for a headset that a store buys for $17.95 and sells for $35.79 Find the amount of markup by subtracting Write a proportion Find the cross product Simplify

8. Find the percent of markup for a model boat that costs you $14.80 and you sell for $20. Find the amount of markup by subtracting Write a proportion Find the cross product Simplify

9. The difference between the original price and the sale price of an item is called the discount. The percent of decrease is the percent of discount.

10. During a clearance sale, a keyboard that normally sells for $49.99 is discounted to $34.99. What is the percent of discount? Find the amount of discount by subtracting Write a proportion Find the cross product Simplify

11. Find the percent of discount of a $24.95 novel that is discounted to $14.97 Find the amount of discount by subtracting Write a proportion Find the cross product Simplify