Fundamentals of Cost Accounting 2nd Edition by William Lanen, Carolyn Wells, Michael Maher

Exercise 34

Make-or-Buy Decisions
Mobility Partners makes wheelchairs and other assistive devices. For years it has made the rear wheel assembly for its wheelchairs. A local bicycle manufacturing firm, Trailblazers, Inc., offered to sell these rear wheel assemblies to Mobility. If Mobility makes the assembly, its cost per rear wheel assembly is as follows (based on annual production of 2,000 units):

Trailblazers offered to sell the assembly to Mobility for $110 each. The total order would amount to 2,000 rear wheel assemblies per year, which Mobility's management will buy instead of make if Mobility can save at least $10,000 per year. Accepting Trailblazers's offer would eliminate annual fixed overhead of $40,000.
Required
Should Mobility make rear wheel assemblies or buy them from Trailblazers Prepare a schedule that shows the differential costs per rear wheel assembly.