Answer
Option C
Decrease in cost $132,672
Explanation:
To determine the increase or decrease in costs associated with making, we will compare the relevant costs of the two options as follows
$
Variable cost of making 10
Variable cost buying 14
Savings in cost per from making 4
Total cost savings (decrease) 4 × 33,168 = $132,672
Decrease in cost as result of making =$132,672