Melissa wants to buy a new pair of shoes that have an original price of $45. Melissa has a coupon for 20 percent off to use on them, which amounts to a discount of $9. If sales tax is 9 percent on the final price of the shoes, how much tax will she need to pay?

First subtract the $9 coupon discount from the original $45 price: $45 − $9 = $36. Sales tax is charged on this discounted price, so calculate 9% of $36: 0.09 × $36 = $3.24. Melissa will pay $3.24 in tax, which is choice A.

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