1. 2-7 Percent Of Change CCSS: N.Q.1,A.REI.3

2. Percent of change is the ratio of change in an amount to the original amount expressed as a percent If the new number is greater than the original number, the percent of change is a percent of increase If the new number is less than the original number, the percent of change is a percent of decrease

3. Example 1 Determine whether each percent of change is a percent of increase or percent of decrease. Then find the percent of change Original: 20Original:25 Final: 23Final: 17

4. Original: 66Original: 9.8 Final: 30Final: 12.1 Original: 24Original: 500 Final: 40Final: 131

5. Example 2 The total number of passengers on cruise ships increased 10% from 2007 to 2009. If there were 17.22 million passengers in 2009, how many were there in 2007

6. A recent percent of increase in tuition at Northwestern University, in Evanston, Illinois, was 5.4%. If the new cost is $33,408 per year, find the original cost per year

7. Example 3: Sales Tax Marta is purchasing wire and beads to make jewelry. Her merchandise is $28.62 before tax. If the tax is 7.25% of the total sales, what is the final cost?

8. A new DVD costs $24.99. If the sales tax is 6.85%, what is the total cost?

9. Example 4: Discounts Since Tyrell has earned good grades in school, he qualifies for the Good Student Discount on his car insurance. His monthly payments without the discount is $85. If the discount is 20%, what will he pay each month?