Widgeon Co. manufactures three products: Bales, Tales, and Wales. Their 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. Assuming that Widgeon Co. can sell all of the products it can make, what is the maximum contribution margin it can earn per month?

a.$56,000

b.$70,000

c.$34,000

d.$49,000