
Answer and Explanation:
a. The total incremental cost of making 54,000 units is shown below
Incremental Costs to Make
Particulars       Amount Per Unit  Fixed Costs Total Relevant Costs
Variable Cost Per Unit $4.05             $218,700 (54,000 units × $4.05)
Fixed Manufacturing Costs      $85,000     $85,000
Total Incremental Costs to Make           $303,700
b The total incremental cost of buying 54,000 units is given below
Particulars       Amount Per Unit  Fixed Costs Total Relevant Costs
Variable Cost Per Unit $3.70                 $199,800 (54,000 units × $3.70)
Total Incremental Costs to Buy           $199,800
c. Â As we can see that the company should buy the component from outside supplier as it reflects the a lower total incremental cost of $199,800 as compared to the making cost i.e $303,700