Mountain air limited manufactures a line of room air purifiers. management is currently evaluat-

ing 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 7.00
total $16.50

these cost predictions include $50,000 in fixed factory overhead averaged over 10,000 units.
the completed air purifier units include a battery-operated electric motor, which mountain air
assembles with parts purchased from an outside vendor for $2.00 per motor. mini motor company
has offered to supply an assembled battery-operated motor at a cost of $5.00 per unit, with a mini-
mum 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.

required

a. determine whether mountain air should continue to make the electric motor or outsource it
from mini motor company. (hint: analyze the relevant costs of making the "motors," not the
entire air purifier.)
b. if it could otherwise rent the motor-assembly space for $20,000 per year, should it make or
outsource this component?
c. what additional factors should it consider in deciding whether to make or outsource the elec-
tric motors?