Thornton Company paid $$101,000$ to purchase a machine on January $1,$ Year $1.$ During Year $3,$ a technological brea the development of a new machine that costs $$102,000.$ The old machine costs $$48,000$ per year to operate, but could be operated for only $$13,000$ per year. The new machine, which will be available for delivery on January $1,Y$ expected useful life of five years. The old machine is more durable and is expected to have a remaining useful life current market value of the old machine is $$31,000.$ The expected salvage value of both machines is zero.