Answer: Beta should buy from the outside supplier
Step-by-step explanation:
If Beta produces the product itself, only avoidable costs would be accounted for:
= Direct labor + Direct material + Unavoidable overhead
= 10 + 20 + ( (1 - 40%) * 50)
= 10 + 20 + 30
= $60
If however, Beta buys the product, they will buy at $58 per unit which is less than the $60 they would make it for.
Beta should buy the product because they will be able to save $2 per unit.