Ratios, Proportions, and Percents Unit Study Guide

An aquarium has 14 angelfish, 12 clownfish, and 18 seahorses in one exhibit. Write a ratio in simplest form.

angelfish to seahorses

Vince took out a $500 loan to buy a new couch. He paid back the loan in 2 years and paid a total of $570. What was the simple interest rate for his loan?

What was the simple interest rate on a $8,000 investment that was left in an account for 18 months and earned $360 in interest?

Marcus borrowed $9,000 from his bank to buy a car. The bank charged him a simple interest rate of 1.25%. By the time he paid back the money, he had paid a total of $9,281.25. How long did it take Marcus to pay back the money?

Chelsey put $450 into an account with a simple interest rate of 2.5%. When she withdrew the money she had earned a total of $67.50 in interest. How long did she leave the money in the account?

Tyler borrowed $42,000 from the bank to open up a skateboard shop. If he had a simple interest rate of 5%, how much will he have paid to the bank in total once he paid the loan back in full after 15 years?

Simon put $15,000 in an account with a simple interest rate of 4.5%. Calculate the amount of interest earned at the end of 8 years. Round to the nearest tenth or cent when necessary.

Rachel owns a cupcake shop. Last week she used 42.5 pounds of sugar making cupcakes. This week she used 26 pounds of sugar. Find the percent change in the amount of sugar used. Classify as a percent increase or decrease. Round to the nearest tenth percent.

The James family purchased their home in 2000 for $175,000. They sold their home in 2017 for $250,000. Find the percent of change in the value of their home. Classify as a percent increase or decrease. Round to the nearest tenth.

David works for the postal service. Last week he drove a total of 350 miles delivering mail and this week he drove a total of 415 miles. What is the percent of change in the number of miles driven? Classify as a percent increase or decrease. Round to the nearest tenth percent.