What level of volume is necessary to justify making the part?

Make or buy, alternative cost functions, qualitative factors Fielder Company is currently purchasing a
component for $13 but is considering making the part internally. The plant engineer has suggested two alternatives.
The first alternative would increase fixed costs by $12,000 per month and incur variable costs of $9 per part. The
second alternative would increase fixed costs by $20,000 and incur variable costs of $7 per part.
REQUIRED
:
A. What level of volume is necessary to justify making the part?
B. Over what relevant ranges of volume is each alternative optimal?
C. At a level of output of 3,500 units, which alternative is most profitable?
D. List two qualitative or risk factors that could affect this decision.