C18 - RELEVANT COST FOR NON-ROUTINE DECISION MAKING Woodville Motors is trying to decide whether it should keep its existing car washing machine or purchase a new one that has technological advantages (which translate into cost savings) over the existing machine. Information on each machine follows: Old machine New machine Original cost $9,000 $20,000 Accumulated depreciation 5,000 Annual cash operating costs 9,000 4,000 Current salvage value of old machine 2,000 Salvage value in 10 years 500 1,000 Remaining life 10 yrs. 10 yrs. Refer to Woodville Motors. The $4,000 of annual operating costs that are common to both the old and the new machine are an example of a(n) a. sunk cost. b. irrelevant cost. C. future avoidable cost. d. opportunity cost