Answer:
See below.
Step-by-step explanation:
This is a make or buy decision that the company has to make.
We assume that the fixed overheads are not relevant - that is they are non incremental and would have to be purchased regardless of the company buying or making steel wheels.
We compare the costs as,
Cost of buying = $35
Cost of making = Direct material + Direct labor + variable overhead
Cost of making = 13 + 12 + 11 = $36
Since the marginal cost of making is more than the marginal cost of buying, Ferro Inc should consider buying steel wheels from the outside supplier as it gives Ferro a saving of $1/ wheel
Hope that helps.