EX 25-7 Make-or-buy decision OBJ. 1 Sapphire Computer Company has been purchasing carrying cases for its portable comput- ers at a purchase price of $89 per unit. The company, which is currently operating below full capacity, charges factory overhead to production at the rate of 40% of direct labor cost. The total unit costs to produce comparable carrying cases are expected to be as follows: Direct materials $53.00 Direct labor 26.00 Factory overhead (40% of direct labor) 10.40 Total cost per unit $89.40 If Sapphire Computer Company manufactures the carrying cases, fixed factory overhead costs will not increase and variable factory overhead costs associated with the cases are expected to be 15% of the direct labor costs. a. Prepare a differential analysis dated February 24 to determine whether the company should Make Carrying Case (Alternative 1) or Buy Carrying Case (Alternative 2). b. On the basis of the data presented, would it be advisable to make the carry- ing cases or to continue buying them? Explain