Answer:
d) $56,000 decrease
Step-by-step explanation:
In the case when parts are produced by sharp corporation
Given that
Total cost per unit = $36
Total cost = Total cost per unit × parts
= $36 × 8,000
= $288,000
Now
If the parts are Purchased by the outside supplier, fixed costs decreased by one-fourth.
So, three-fourth fixed costs should be incurred.
Now
Total cost per unit = Purchase Price + three - fourth fixed costs
= $28 + (3 ÷4) × $20
= $28 + $15
= $43
Now
Total cost = $43 × 8,000
= $344,000
So, the operating income is
= $288,000 - $344,000
= $56,000 decrease