Question

Troy Engines, Ltd., manufactures a variety of engines for use in heavy equipment. The company has always produced all of the necessary parts for its engines, including all of the carburetors. An outside supplier has offered to sell one type of carburetor to Troy Engines, Ltd., for a cost of $36 per unit. To evaluate this offer, Troy Engines, Ltd., has gathered the following information relating to its own cost of producing the carburetor internally:

	Per Unit	15,000 Units per year
Direct materials	$12	$180,000
Direct labor	12	180,000
Variable manufacturing overhead	4	60,000
Fixed manufacturing overhead, traceable	6*	90,000
Fixed manufacturing overhead, allocated	9	135,000
Total cost	43	$645,000

*One-third supervisory salaries; two-thirds depreciation of special equipment (no resale value).

Required:

1. Assuming the company has no alternative use for the facilities that are now being used to produce the carburetors, what would be the financial advantage (disadvantage) of buying 15,000 carburetors from the outside supplier?

2. Should the outside supplier’s offer be accepted?

3. Suppose that if the carburetors were purchased, Troy Engines, Ltd., could use the freed capacity to launch a new product. The segment margin of the new product would be $150,000 per year. Given this new assumption, what would be the financial advantage (disadvantage) of buying 15,000 carburetors from the outside supplier?

4. Given the new assumption in requirement 3, should the outside supplier’s offer be accepted?

Answer 1

1) Differential analysis

	Make	Buy
Direct material	180000
Direct labor	180000
Variable manufacturing overhead	60000
Fixed manufacturing overhead (90000/3)	30000
Purchase cost (15000*36)		540000
Total relevant cost	450000	540000

Financial disadvantage = 450000-540000 = -90000

2) No

3) Differential analysis

	Make	Buy
Direct material	180000
Direct labor	180000
Variable manufacturing overhead	60000
Fixed manufacturing overhead (90000/3)	30000
Opportunity Cost	150000
Purchase cost (15000*36)		540000
Total relevant cost	600000	540000

Financial advantage = 600000-540000 = 60000

4) Yes