Percent Proportions and Percent Change and Error

If 20% of a number is 40, what is the number?

• 100

• 200

• 150

• 250

Jason spends $450 for transportation. This is 25% of his monthly salary . How much money did he earn each month?

• $1800

• $800

• $900

• $1000

While mining, John found a large metal bar that weighed 25 ounces. John was also able to determine that the bar had 15 ounces of lead. What percent of the weight of the bar was lead?

• 40%

• 50%

• 60%

• 70%

A jogging route is 10km long. Zaman has jogged 4km. What percentage of the route has Zaman jogged?

• 4%

• 10%

• 80%

• 40%

The regular price of a scooter is $65.50. It is on sale for $52.40. What is the percent decrease from the regular price to the sale price of the scooter?

• 35%

• 25%

• 30%

• 20%

What percent of 96 is 88?

• 91.7%

• 109%

• 84.5%

• 88%

Find the percent of change. Round to the nearest tenth of a percent.

From $18.50 to $22.10

• 19.5% increase

• 16.3%

• 16.2%

• 19.6%

Find the percent error. Round to the nearest tenth of a percent.

Actual speed: 38 mph

Estimated speed: 35 mph

• 8.1%

• 0.79%

• 7.9%

• 6.8%

Find the percent of change. Round to the nearest tenth of a percent.

From 53 words to 62 words

• 14.5% increase

• 16.9% increase

• 17.0% increase

• 85% increase

Find the percent error. Round to the nearest tenth of a percent.

Estimated length: 32 in.

Actual length: 54 in.

• 27.4%

• 70.4%

• 41.8%

• 40.7%