Answer: See explanation
Step-by-step explanation:
a. Direct material = 4 × 33300 = Make $133200 ; Net income increase
Direct labor = 5 × 33300 = Make $166500 ; Net income increase
Variable costing= 0.61 × $166500 = Make $101565 ; Net income increase
Fixed manufacturing = Make 43100 ; Buy 43100 ;
Purchase price = 13.16 × 33300 = Buy $438228 ; Net income decrease
Total annual cost:
Make: $444365
Buy: $481328
Net income decrease = $36963
b. No, Pottery Ranch should not buy the finials. There's an incremental cost of $36963.
c. Incremental revenue = $50,367
Incremental cost = $36963
Incremental revenue = $50367 - $36963 = $13404
In this case, it should be bought.