Answer:
A. An increase of $4,500
Step-by-step explanation:
For computing the total cost change, first we have to determine the total cost which is shown below
= Direct Materials cost + Direct Labor costs + variable overhead costs
= $21,000 + $5,500 + $19,000
= $45,500
And, the outside purchase is $50,000
So, the total cost change would be
= $50,000 - $45,500
= $4,500 increase