Answer:
$55,000
Explanation:
The computation of the change in operating income is shown below:
= Buying cost - making cost
where,
Buying cost = Cost of producing parts × outside supplier per unit
= 60,000 parts × $3
= $180,000
And, the making cost would be
= Variable cost + fixed cost × given percentage
= $110,000 + $50,000 × 30%
= $110,000 + $15,000
= $125,000
So, the operating income would be
= $180,000 - $125,000
= $55,000