Johnson enterprises uses a computer to handle its sales invoices. lately, business has been so good that it takes an extra 3 hours per night, plus every third saturday, to keep up with the volume of sales invoices. management is considering updating its computer with a faster model that would eliminate all of the overtime processing. current machine new machine original purchase cost $14,800 $25,200 accumulated depreciation $7,000 _ estimated annual operating costs $24,700 $20,000 remaining useful life 5 years 5 years if sold now, the current machine would have a salvage value of $11,800. if operated for the remainder of its useful life, the current machine would have zero salvage value. the new machine is expected to have zero salvage value after 5 years. should the current machine be replaced?