Question

65 POINTS!!! The price of an Ipad is $499. It is on sale for 18% off at the Apple Store on Mac Monday's. Find the Sales price you will pay plus an 8.875 sales tax rate. Explain and demonstrate the steps involved to answer this question.

Students answer- 499 times 0.18 = 89.82 499+89.82 = 588.82 Total 588.82 + 8.50 = $597.32

Explain what mistake did the student make and why are they incorrect? Then explain how to answer the quessstion the correct way.

Answer 1

The student added the discount instead of subtracting the discount.

They also did not calculate the tax correctly.

Explanation:

Original price is 499

Discount = original price * percent off

Discount = 499 * .18

=89.82

The sale price = original price minus the discount

sale price = 499-89.82

sale price = 409.18

Sales tax = sale price * tax rate

= 409.18 * 8.875%

=409.18*.08875

=36.314725

Rounding to the nearest cent

36.31

Final cost = sale price + sales tax

=409.18+36.31

445.49

The student added the discount instead of subtracting the discount.

They also did not calculate the tax correctly.