Answer and Explanation:
a. The computation is shown below:
Relevant cost per unit on make or buy :
Particulars Make Buy
Direct material 13.00
Direct labor 20.60
Variable manufacturing
overhead 2.80
Fixed manufacturing
overhead 5.30
Purchase cost 42.10
Total relevant cost per unit 41.70 42.10
b) So the advantage in case of purchasing the part instead of making it
= (Making relevant cost - buying relevant cost × number of units) - additional contribution margin
= ($41.70 - $42.10 × 10,000 units) - $36000
= $32000