Madison Optometry is considering the purchase of a new lens grinder to replace a machine that was purchased several years ago. Selected information on the two machines is given below: Old Machine New Machine Original cost when new $80,000 $90,000 Accumulated depreciation to date $20,000 --- Current salvage value $26,000 --- Annual operating cost $5,000 $3,000 Remaining useful life 4 years 4 years Compute the total advantage or disadvantage of using the new machine instead of the old machine over the next four years. Assume that neither machine will have any salvage value at the end of four years. You may use the Excel spread sheet to complete your answer. Copy and paste your answer from Excel to Blackboard in the space provided.