Janko Wellspring Inc. has a pump with a book value of $43,000 and a 4-year remaining life. A new, more efficient pump, is available at a cost of $64,000. Janko can also receive $9900 for trading in the old pump. The new pump will reduce variable costs by $13,900 per year over its four-year life. The costs not relevant to the decision of whether or not to replace the pump are: O $12,600. o $55,600. 0 $13,900. $43,000. $9900