(Ignore the time value of money in this problem.) Glenmore Optometry is considering the purchase of a new lens grinder to replace machine that was purchased several years ago. Selected information on the two machines is given below: old New Machine Machine Original cost when new $80,000 $90,000 Accumulated depreciation to date $20,000 Current salvage value $26,000 $5,000 Annual operating cost $3,000 4 years 4 years Remaining useful life Required: 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. Show your work for full marks