Mountain Air Limited manufactures a line of room air purifiers. Management is currently evaluating the possible production of an air purifier for automobiles. Based on an annual volume of 10,000 units, the predicted cost per unit of an auto air purifier follows. Direct materials $8.00 Direct labor 1.50 Factory overhead 8.00 Total $17.50 These cost predictions include $60,000 in facility-level fixed factory overhead averaged over 10,000 units. One of the component parts of the auto air purifier is a battery-operated electric motor. Although the company does not currently manufacture these motors, the preceding cost predictions are based on the assumption that it will assemble such a motor. Mini Motor Company has offered to supply an assembled battery-operated motor at a cost of $5.00 per unit, with a minimum annual order of 5,000 units. If Mountain Air accepts this offer, it will be able to reduce the variable labor and variable overhead costs of the auto air purifier by 50 percent. The electric motor's components will cost $2.00 if Mountain Air assembles the motors.