12 points 1 eBook that should be manufactured. b. What is the increase (decrease) in net operating income that would result from this plan over current operations? 5. Compute the contribution margin per unit. [assume direct labor is a variable cost] 6. Compute the contribution margin per welding hour. [assume direct labor is a variable cost] 7. Assuming direct labor is a variable cost: a. Determine the number of WVD drums (if any) that should be purchased and the number of WVD drums and/or bike frames (if any) that should be manufactured. b. What is the increase (decrease) in net operating income that would result from this plan over current operations? Complete this question by entering your answers in the tabs below. Print Req 1 Req 2 Req 3 Req 4A Req 4B Req 5 Req 6 Req 7A Req 7B References Compute the contribution margin per unit. [assume direct labor is a fixed cost] (Do not round intermediate calculations. Round your answers to 2 decimal places.) a. Purchased WVD drums b. Manufactured WVD drums c. Manufactured bike frames Contribution Margin per unit per unit per unit < Req 1 Req 3 >