Make-or-Buy Decision direct labor cost. The unit costs to produce comparable carrying cases are expected to be as follows: Direct materials Direct labor Factory overhead ( 45% of direct labor) Total cost per unit $26 21 9.45 $56.45 minus sign to indicate a loss. Differential Analysis Make Carrying Case (Alt. 1) or Buy Carrying Case (Alt. 2) September 30 Sales price Unit costs: Purchase price Direct materials Direct labor Variable factory overhead Fixed factory overhead Income (Loss) Make Carrying Case (Alternative 1) Buy Carrying Case (Alternative 2) Differential Effect on Income (Alternative 2)