Mika bought 1 vintage movie poster, 1 rock poster, and 2 rap posters. She had a coupon for half off her entire purchase.

Part 1: Select the numerical expression that shows how much Mika paid for the posters.

A) [28.50 + 29.75 + 2(19.50)] ÷ 2
B) 28.50 + 29.75 + 19.50 + 19.50 ÷ 2
C) [28.50 + 29.75 + 19.50 + 19.50] ÷ 1/2
D) [28.50 + 29.75 + 2(19.50)] ÷ 1/2