Percent Increase, Decrease and Error

A school's population increased from 1250 to 2000 students. What was the percent of increase?

• .375%

• .6%

• 37.5%

• 60%

Last week, the price of American cheese was $5 per pound. This week, it costs $6 per pound. What is the percent change? 

• Increase 20%

• Decrease 20%

• Increase $1

• Decrease $1

An online auction started the bid on an item at $20. The item sold for $50. What was the percent increase to the nearest percent?

• 150%

• 15%

• 60%

• 17%

You estimate that you sent 135 texts last week, but when you get the bill it was actually 108. What was your percent error?

• 20%

• 25%

• -20%

• -25%

You estimate that 200 people attend a school concert. The actual attendance was 240.   What is the percent error?

• 20%

• -20%

• -16.7%

• 16.7%

In 1999, the price of unleaded fuel was $1.09.  In 2015, the price of unleaded fuel is $1.89. What is the percent change?

• 173% increase

• 73% increase

• 73% decrease

• 27% increase

The first marking period, Ricky scored an 80 in math. The second marking period, Ricky's grade was an 86. What was the percent change?

• 7.5% increase

• 7.5% decrease

• 7% increase

• 7% decrease

An archaeologist estimated that a fossil was 520 years old. It was actually 500 years old. What was the percent error?

• 4%

• 20%

• 3.8%

• none of these

Mr. Nacerino estimates that it will take him 48 minutes to run 8 miles. It actually takes him 60 minutes. What was his percent error?

• 20%

• 12%

• 25%

• 8%

The temperature in one day goes from 10^o to 15^o. What is the percent change?

• 50% increase

• 50% decrease

• 33% increase

• 33% decrease