Lesson 10- Percent of Change

What is the percent of change if 80 is decreased to 8?

• 10%

• 72%

• 88%

• 90%

What is the percent of change if 100 is increased to 160?

• 37.5%

• 60%

• 62.5%

• 160%

A sports store keeps track of how many skateboards they sell each month. Last month, they sold 302 skateboards. This month, they have sold 228 skateboards. What is the percent of change in skateboard sales?

• 24.5 % decrease

• 24.5 % increase

• 32.5% decrease

• 32.5 % increase

A jeweler bought an antique watch for $500. He then sold it in his store for $850. What was the percent of change in the price of the watch?

• 41.2% decrease

• 41.2% increase

• 70% decrease

• 70% increase

At Kennedy Middle School, there are 239 eighth-grade students. Last year, there were 197 students. What is the percent of change in the eighth-grade enrollment?

• 17.6% increase

• 21.3% increase

• 82.4% increase

• 121% increase

Nick is in a bowling league. This is his second year in the league. Last year his average was 115. This year, his average so far is 131. What is the percent of change in his bowling average?

• 12.21% increase

• 13.91% increase

• 16% increase

• 87.79% increase

In October 2007, a gallon of gas cost an average of $2.77. In October 2008, a gallon of gas cost an average of $3.15. What is the percent of change in gas prices from 2007 to 2008?

• 12.06% increase

• 12.06% decrease

• 13.72% increase

• 13.72% decrease

Marta decided to sell some of her CD collection at her family’s garage sale. She reduced her collection by 30%. If she began with 130 CDs, how many does she have now?

• 23 CDs

• 39 CDs

• 91 CDs

• 100 CDs

The temperature this morning when Vu woke up was 68°F. When he checked the temperature again, there was a 20% increase in the temperature. How many degrees did the temperature increase?

• 13.6°

• 20°

• 81.6°

• 88°

Trevor is buying a suit. The one that he likes costs $275. It is on sale for 35% off. How much will he have to pay for the suit?

• $96.25

• $178.75

• $205.00

• $250.00