A piece of equipment that was purchased for $40,000 five years ago has a current of maintenance can provide service for another three years be an operating and can to be cost of $10,000 during next year, $15,000 during the following year, from $5,000 the year after that. The market value of this is now. a year now, years from now and zero three years below A special purpose machine can purchased for $50,000. The Year shows the operation and Maintenance cost for the year and the estimated salvage value at the end of each of service. If the MARR is 15% per year compounded yearly, when should the old equipment be replaced by the new one