Jo makes 2 products, A and B. Both products require labour hours for assembly. Total labour hours are limted to 5,000 hours a month. Based on the following per unit data which product maximizes the contribution margin per labour hour, and what is its contribution margin per labour hour?

Product A has a selling price = $10, a variable cost = $6, and requires 0.5 labour hours to assemble

Product B has a selling price = $12, a variable cost = $7, and requires 2 labour hours to assemble

a Product A : $4

b Product B : $5

c Product A : $8

d Product B : $10