Items can he purchase to spend the most of the $50, after applying the coupon is that he can buy the jeans, khaki pants and the t-shirts. The total cost before coupons is $60. After the coupon is applied, the total cost is $48. Below is the solution:
20 + 20 + 15 = $60
20% OF 60 = 12
60 - 12 = $48