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 7 hours to process, Tales take 4 hours, and Wales take 1 hour. What is the contribution margin per machine hour for Bales? O $7 $5 O $35 $28