Make-or-Buy Decision Watts Technologies Company has been purchasing carrying cases for its portable tablets at a delivered cost of $6.50 per unit. The company, which is currently operating below full capacity, charges factory overhead to production at the rate of 60% of direct labor cost. The fully absorbed unit costs to produce comparable carrying cases are expected to be as follows: Direct materials $2.00 Direct labor 3.25 Factory overhead (60% of direct labor) 1.95 Total cost per unit $7.20 If Watts Technologies 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 20% of the direct labor costs. a. Prepare a differential analysis report for the make-or-buy decision. Enter your final answer as a positive amount if it represents a net cost savings; enter a negative amount if it represents an increase in cost.