Answer:
a. $ 32
Explanation:
Computation of purchase price
The company can make the components with a variable cost which is as follows:
Direct Materials per unit                           $ 12
Direct Labour   per unit                           $  8
Variable Manufacturing overhead per unit           $  12
Total Variable Cost  per unit                       $ 32
Since the fixed manufacturing overhead shall not be reduced, the maximum price that can be paid is the internal variable costs.
So the maximum purchase price is $ Â 32 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â