Chapter 7, Problem 33CP

To determine

To Calculate: The final cost of buying of a computer after accounting for a discount and a sales tax.

Answer to Problem 33CP

The final cost is $\$639$ .

Explanation of Solution

Given Information: The original price is $\$800$ . The discount is $25\%$ . The sales tax is $6.5\%$ .

Method: First subtract the discount amount from the original price. The add sales tax on this discounted price.

Write $25\%$ in decimal form as $0.25$ and $6.5\%$ in decimal form as $0.065$

The discounted price is

  $800-25\%\cdot 800 = 800 - 0.25\cdot 800 = 800-200 = \$600$

The final cost after sales tax on the discounted price is

  $600+6.5\%\cdot 600 = 600+0.065\cdot 600 = 600+39=\$639$