Make-or-Buy Decision Pizana Computer Company has been purchasing carrying cases for its portable computers at a purchase price of $18 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 unit costs to produce comparable carrying cases are expected to be as follows: If Pizana 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 25% of the direct labor costs. a. Prepare a differential analysis dated May 31 to determine whether the company should make (Alternative 1 ) or buy (Alternative 2) the carrying case. If an amount is zero, enter " 0 ". If required, round your answers to two decimal places. b. Assuming there were no better alternative uses for the spare capacity, it would to manufacture the carrying cases. Fixed factory overhead is to