The Percent Proportion
What is 20% of 50?
10
Find the percent change: A family of rabbits grows from 8 rabbits to 12 rabbits
50% increase
You estimate a person's height to be 55 inches, but they're actually only 50 inches tall. What is the percent error of your estimate?
5%
A $20 pair of sweatpants is on sale for 10% off. What is the new price?
$18
How much simple interest do you earn over 6 years if you deposit $120 in a bank account with a 3% interest rate?
$21.60
62 is what percent of 200?
31%
Find the percent change: The height of a mountain was 3.5 miles one thousand years ago, but erosion has brought it down to 3 miles in height.
14.3% decrease
You purchase a bag of Skittles from Walmart that is advertised to weigh 28.6 ounces, but when you put it on your scale it only weighs 24 ounces. What is the percent error on this bag of candy?
16.1% or 16.08%
A store purchases a laptop computer for $500 and marks it up for sale by 30%, what is the sale price of the computer?
$650
What is your loan balance after 5 years if you take out $700 with an 8% interest rate?
$980
14 is 35% of what number?
40
Find the percent change: A 12 year old is 60 inches tall. At 2 years old they were 24 inches tall.
150% increase
You estimate the number of Jolly Ranchers in a bag which you find actually has 144 pieces of candy in it. When you calculate the percent error of your guess you find that it was 12.5%. How far off was your guess?
You were off by 18 candies
A scooter is on sale for $60 after being put on sale for 20% off. What was the original price of the scooter?
$75
How long will it take to earn $12.50 of interest if you deposit $250 in an account with a 2.5% interest rate?
2 years
What number is 12.5% of 62?
7.75
Find the percent change: Westlake is home to 900 students. In 2017 it was home to 1100 students.
18.2% decrease
You estimate the height of a building which is 200 feet tall. It turns out you had a percent error on your estimate of 32%, what could your estimate have been?
Estimates could have been either 136 feet or 264 feet.
A coat is marked by 40% to a retail price of $85. What did the coat cost the store to purchase?
$60.71
You take a $500 loan out. After 4 years you have accrued $180 in interest. What is the interest rate on the loan?
9%
125% of 60 is what number?
75
Find the percent change: A runner's best time in the mile race is 8.2 minutes. Two years ago their personal best was 9.5 minutes.
13.7% decrease
You are playing a string cutting game at an arcade. You need to cut the string when the scissors move up to be 3/4 of the way up the string, but you miss time the button press and try when the scissors are 5/8 of the way up the string. How much error was there in your timing?
16.7% or 16.66%
A model train set costs a store $120.50 to purchase. If they sell the set for $149.99, what is the markup percentage?
24.5%
You deposit some money into a bank account which earns you $280 simple interest after 8 years. If the account has a 3.5% interest rate, how much did you deposit initially?
$1000