Percent Error
This is the equation for Percent Error.
(Error/Actual)*100
A store bought a toy for $15 and marked up the price by 20%. What is the cost to buy the toy?
$18
A shirt costs $20, but it's 30% off! How much does it cost?
$14
10 percent of 30
3
50%
Estimated value = 105 g. Actual value = 100 grams.
What is 5% error?
Your coffee costs $3 and you tip 15%. How much do you spend on coffee?
$3.45
Typically, a flight from here to LA costs $340. However, flights are 25% off today! What is the cost of the flight?
20 percent of 65
13
What percent is 15 out of 60?
25%
This is the percent error of an actual value of 75 mL and estimated value of 15 mL.
What is 80% error?
Harry buys a phone case for $15. Tax is 6%. How much does the phone case cost after tax?
$15.9
Enrollment at the gym has dropped by 5% this year. If there used to be 360 members, how many are there now?
7 percent of 55
3.85
What percent is 80 out of 40?
200%
This is the percent error of an estimated value of 28.3 and actual value 25.7 cal/g.
What is 10.1% error?
Dinner cost $100. Tax is 10%, and you tip 20% of the post-tax cost. How much did you spend on dinner?
$132
The headphones you've been wanting cost $80, but you have a coupon for 45% off! How much will the headphones cost?
$44
63 percent of 2.8
1.764
What percent is 3.2 out of 9.6?
33.3
This is the percent error of an estimated value of 97.5 degrees and an actual value of 100 degrees.
What is 2.5% error?
Tina makes $10 an hour at a shoe store. She also makes 5% commission on however much she sells. On Monday, she worked for 5 hours and sold $200 worth of shoes. How much money did she make?
$60
A store marks down their prices by 15% for a sale. You wanted to buy something that cost $60. What does it cost now?
$51
132 percent of 65
85.8
What percent is 5.2 out of 6.4?
81.25