Clarissa is shopping during a tax-free weekend. She buys x items that cost $12 each and y items that cost $18 each. She receives 20% off her total by using a store coupon. Which of the following represents the total amount that Clarissa pays?
A.
0.8(9.6x + 14.4y)
B.
14.4x + 9.6y
C.
0.2(12x + 18y)
D.
0.8(12x + 18y)