Simple Percent Problems

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%

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%

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

Emily receives a 9.8% raise. She currently earns $1789.46 per month. What will her new monthly earnings be?

• $175.37

• $1964.83

• $1753.67

• $1950.51

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%

Jay borrows $1200 from a bank with 8% simple interest per year. How much will he have to pay back total after 2 years?

• $192

• $1350

• $1392

• $150

The rate is given as a percent (%).  Before using it in the simple interest formula, you must first convert it to a______.

• fraction

• decimal

• ratio

• dollar amount

Jennifer has a coupon for 25% off her entire meal of $17.89. What is the discount?

• $13.42

• $4.47

• $4.48

• $0.44