Percent Change & Error
Commission
Tax & Interest
Discount
Final Jeopardy
400

Reggie bought 40 tokens to use at a family fun center. He used some of the tokens to ride go-carts and use the batting cages. He now has 28 tokens left. What is the percent of decrease in the number of tokens? Round to the nearest tenth percent if necessary.

30%

400
A salesperson earns commission on the sales that she makes each month.

  • The salesperson earns 5% commission on the first $5,000 she has in sales.

  • The salesperson earns 7.5% commission on the amount of her sales that are greater than $5,000.

Part B:  The salesperson earned $1,375 in commission last month. How much money, in dollars, did she have in sales last month?  Explain how you got your answer.

$20,000

400

Ling paid $1.15 in sales tax on a purchase of $18.40. What is the sales tax rate?

6.25%

400


A backpack is being sold at an online store.  If a customer uses a discount code that offers a 25% discount and free shipping, the backpack will cost $17.25.  There is no sales tax if the customer buys the backpack online.

What is the original price of the backpack from the online store?


$23

500


Jake is a factory manager for a company that produces batteries. Occasionally, some are found to be defective. Based on previous results, Jake estimates that 12 batteries will be defective for a certain month. However, 10 were actually defective. What is the percent error of Jake’s estimate?

20%

500
A salesperson earns commission on the sales that she makes each month.

  • The salesperson earns 5% commission on the first $5,000 she has in sales.

  • The salesperson earns 7.5% commission on the amount of her sales that are greater than $5,000.

Part A:   This month the salesperson had $8,000 in sales. What amount of commission, in dollars, did she earn?

$475

500

Tyler's savings account pays a simple annual interest rate of 3.25%. Suppose he deposits $5,000 in the account and makes no additional deposits or withdrawals for 3 years. What will the total value of the account be after 3 years? (Include the dollar sign in your answer.)

$5,487.50

500
A customer wants to purchase a sweater from a store.

  • The original price of the sweater is $40.

  • The sweater is on sale for 10% off the original price.

  • The customer has a coupon for 25% off the sale price.

The customer claims that she can determine the final price of the sweater by taking 35% off the original price since 10% + 25% = 35%.


Determine if the customer’s claim is correct. Justify your decision, showing your thinking or your work in the space provided.


They are incorrect

500

A store owner paid $15 for a book. She marked up the price of the book by 40% to determine its selling price. The book is discounted 25%.  The customer must pay 6% sales tax on the discounted price of the book.  What is the total amount, in dollars, the customer pays for the discounted book? (Include the dollar sign in your answer.) 

$16.70

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