Percent of Increase/Decrease, Percent of Error, Simple Interest

Jose started doing extra chores around the house and his allowance changed from $30 per week to $40 per week. What is the approximate percent of change in Jose's allowance?

• Increase of 33.3%

• Increase of 25%

• Increase of 30.3%

• Increase of 38%

Mrs. Banks bought a car for $25,000 and sold it 5 years later for $16,000. Find the percent decrease for the price of the car.

• 36%

• 9%

• 34%

• 26%

Zed went to the store and bought a bag of chips.  He estimated there would be 350 chips in the package, but realized there were only 210 chips in that package.  What was his approximate percent error?

• 35%

• 67%

• 85%

• 92%

Miss Sylvie miscounted and thought she saw 33 children on the bus. When she counted again, she realizes there are actually only 30 students on the bus. What is her percent error?

• 10%

• 9%

• 90%

• 91%

Hank is buying a shirt that originally cost $25.00. It was on sale two weeks ago for 10% off. Today, it is an additional 20% off the original price. How much is the shirt now?

Sam had 9 puppies. After giving some away, Sam had 4 puppies left. What is the percent change in the number of puppies? Round to nearest whole percent if necessary.

• 56% decrease

• 125% decrease

• 56% increase

• 125% increase

Lisa's little brother weighed 8 pounds when he was born. He now weighs 36 pounds. What is the percent increase in the boy's weight?

• 350%

• 4%

• 40%

• 78%

It costs a florist $14.50 to grow a dozen roses. She sells a bouquet of a dozen roses for $24.99. What is the markup (percent increase) to the nearest percent?

• 72%

• 42%

• 172%

• 58%

Linda started a savings account for her nephew with $3,000. The account earned 5% simple interest. How much interest did the account accumulate in 4 months?

• $50.00

• $600.00

• $60,000.00

• $4999.95

Mark took out a loan for $2,450.00 at 7% simple interest for 2 years. How much interest did he pay on the loan?

• $343

• $34,300

• $28.58

• $2,858.33