Widgeon Co. manufactures three products: Bales, Tales, and Wales. The selling prices are $55, $78, and $32, respectively. The variable costs for each product are $20, $50, and $15, respectively. Each product must go through the same processing in a machine that is limited to 2,000 hours per month. Bales take 5 hours to process; Tales, 7 hours; and Wales 1 hour.

What is the contribution per machine hour for Wales?

a.$35

b.$17

c.$7

d.$28