Answer the following question(s) using the information below. Burger Bob's Boathouse sells only one product. 7,000 units were sold In year resulting in $70,000 of sales revenue. Variable costs were $28,000 for the year, and fixed costs were $12,000. 4. Contribution margin per unit is a. $4.00 b. $4.29 c. $6.00 d. $10.00 $5.71 e