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Question:

Camille uses a 20% off coupon when buying a sweater that costs $47.99. If she also pays 6% sales tax on the purchase, how much does she pay?

A $40.69
Explaination

First, compute the price of the sweater after the discount: Discounted price of the sweater:
(100%-20%)($47.99)= 80%($47.99)
0.80(47.99) = $38.39
Second, add the sales tax:
Total amount paid:
$38.39 + $38.39(6%)
38.39 + 38.39(.06)
38.39 + 2.30 = $40.69