Percent Proportion and Percent Change

One week, 72 people got a speeding ticket. The next week, only 36 people got a speeding ticket. What is the percent of change in the speeding tickets?

• Increase 50%

• Decrease 50%

• Increase 1%

• Decrease 1%

A team of biologists used population sampling to determine that there are currently 350 chameleons living in a particular ecosystem. That same ecosystem had a population of 580 chameleons three years ago. Which is closest to the percent decrease in the chameleon population?

• 230%

• 40%

• 66%

• 28%

Marine biologists who have been studying the great white shark population off the coast of California have discovered that the number of great white shark sightings in areas commonly frequented by beach-goers have increased dramatically over the last 10 years. In 2000, there were 17 sightings of great white sharks. In 2010, there were 32 sightings of great white sharks. Which is the best estimate of the percent change in the number of great white shark sightings?

• 15%

• 88%

• 47%

• 24%

The original price of a purse was $45, but it was changed to $54.  Calculate the percent change.

• 9%

• 20%

• 45%

• 54%

Last year the enrollment at Clark Middle School was 465 students. This year the enrollment is 525 students. What is the percent of increase?

• 113%

• 100%

• 13%

• 87%

Austin got 72% of the questions correct on his last math quiz. If there were 25 total questions, how many did he answer correctly?

• 4

• 72

• 18

• 12

Miguel works at a patio furniture store. He sold $4,500 worth of furniture last week. How much commission does he earn, if he earns 4% commission on all sales?

• $1.80

• $180

• $1,800

• $4,680

The hockey team won 63 out of the 84 games it played this year. What percent of the games did the team win?

• 70%

• 72%

• 75%

• 80%

Kasey is out shopping and finds a $36 hat that was marked down by 25%. How much did the hat originally cost?

• $50

• $27

• $48

• $25

A person ate 2400 calories in a day.  Of these, 36% came from fat.  How many calories came from fat?

• 984 calories from fat

• 830 calories from fat

• 1142 calories from fat

• 864 calories from fat