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7th Grade Percent and Interest Review: A Complete Guide to Problem-Solving

This document provides a comprehensive review of percent calculations, simple interest, and percent changes tailored for 7th-grade students. It includes practical examples such as finding percent increases and decreases, calculating interest on loans, and determining retail prices with markups. Students will learn to solve problems like calculating storage capacity using percentages and understanding how to apply commission fees in real-life scenarios. With a focus on essential math skills, this guide helps students build confidence and competence in working with percentages.

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7th Grade Percent and Interest Review: A Complete Guide to Problem-Solving

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  1. 7th Grade Review Percents

  2. Find the percent of change. • 20 is increased to 85 325%

  3. Solve. • Walter borrowed $50,000 from AAA Bank to do remodeling on his house. The simple interest rate is 5.5%. He plans to repay the loan in 8 years. How much interest will Walter pay? • $22,000

  4. Solve. • 16 is 25% of what number? • 64

  5. Solve. • A water tank can hold 45 gallons of water. A new water tank can hold 25% more water. What is the capacity of the new water tank? (round to hundredths place) • 56.25 gallons

  6. Find the percent of change. • 90 is decreased to 75 (Round to nearest tenth of a percent.) • 16.7%

  7. Solve. • George sells cars for Freeman’s Auto Sales. He is paid a base salary of $250 every two weeks plus a 10% commission on his sales. This week he sold an Altima for $18,000. What is his commission? • $1,800

  8. Solve. • A store buys jeans from the manufacturer for $30 each and sells them at a 50% markup in price. What is the retail price of the jeans? • $45

  9. Solve. • What is 91% of 300? • 273

  10. Solve. • A bank is offering 2.5% simple interest on a savings account. If you deposit $5,000, how much interest will you earn in one year? • $125

  11. Solve. • Selena borrowed $9,500 to buy a used car. The credit union charged 7% simple interest per year. She paid $3,325 in interest. For what period of time did she borrow money? • 5 years

  12. Find the percent of change. • 55 is increased to 90 (Round to nearest tenth of a percent.) • 63.6%

  13. Solve. • What is the TOTAL price of a printer that is marked $89.95 if the tax rate is 9%? (Remember this is money!) • $98.05

  14. Solve. • Roz brings home $1,600 each month. She spends 30% of this on rent. How much is her rent? • $480

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