7th 3-4 Percent Change and Percent Error

Find the percent increase for the given original and new quantities.

Original​ quantity: 100 New​ quantity: 106

• 94%

• 106%

• .06%

• 6%

If the original quantity is 100 and the new quantity is 88​, what is the percent​ decrease?

• 114%

• .12%

• 88%

• 12%

If the original quantity is 15 and the new quantity is 19​, what is the percent change?

• 20%

• 27%

• 33%

• 40%

Emily and a friend bought two tickets to see a soccer game. Each ticket cost ​$8.25. The friends paid a total of ​$24.50​, which included a fee per ticket for parking near the stadium. How much did each friend pay for the parking​ fee? What is the parking fee as a percent increase in the cost of a​ ticket?

• 97%

• 48.5%

• 33.7%

• 27.3%

The table shows data from an experiment with two trials. Calculate the percent errors. Which trial had the greater percent​ error?

• A- 120% B- 81.25%

• A- 18.75% B- 20%

• A- 20% B- 18.75%

• A- 83% B- 123%

Estimation: Suppose the original quantity is $30 and the new quantity is $39. Estimate the percent change. Is this an example of a percent increase or a percent​ decrease?

• 30% Increase

• 60% Increase

• 30% Decrease

• 60% Decrease

Jake ordered 12 large pizzas for a party. When the party was over he had 1.5 large pizzas remaining. What is the percent change in the number of large pizzas.

• 700%

• 800%

• 12.5%

• 87.5%

You estimate you will need 12 large pizzas for a party. When the party was over you had needed 10.5 large pizzas. What is the percent error in the number of large pizzas.

• 16.8%

• 12.5%

• 14.3%

• 85.7%

You estimate that your dog weighs 25 pounds. You weigh him and he is 20 pounds. What is your percent error?

• 125%

• 5%

• 20%

• 25%

You estimate that you will get an 85% on a test. You actually get a 75%. What is your percent error?

• 88%

• 10%

• 11.7%

• 13.3%