Math 7th grade algebra for Mrs.Janis's class

Question

Lin's father is paying for a 20 dollar meal. He has a 15%-off coupon for the meal. After the discount,a 7% sales tax is applied. What does Lin's father pay for the meal?

Explain or show reasoning

Answer 1

Since he has a 15% off coupon, you need to determine how much he would save with the coupon.

15% of $20 = 0.15 * 20 = $3

So Lin's dad can subtract $3 from the original bill and then add on the tax:

$20 - 3 = $17

Now 7% of 17 = 0.07 * 17 =$1.19 in tax to be paid

The final amount he will need to pay is : $17 + 1.19 = $18.19