Answer:
C. Buy since the relevant cost to make it is $48.
Explanation:
Factor Co.
Make Buy
Direct material $ 8
Direct labor 24
Overhead 40 24 ( Irrelevant Cost)
Cost of Purchase 46
Total product cost per unit $ 72 $ 70
Irrelevant costs are costs that continue whether the product is produced internally or purchased from outside. Here irrelevant costs are $ 24 that is 60 % of overheads.
The relevant cost to make it is $8+ $24+ $16(40-24)= $ 48
It is better to buy the product as it is a little financially advantageous. $2 per unit.