Based on the fact that the fixed overhead costs to Spahr Company are unavoidable, the company should make the part and save $4 per unit.
The fixed overhead costs are unavoidable which means that the total cost of making the product should be net of this amount:
= 10 - 1
= $9
This means that the company incurs $9 per unit produced. If they made it themselves, they would save:
= Cost of buying - Cost of making
= 13 - 9
= $4
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