Kildee Farms has a tractor with a book value of $75,000 and a remaining useful life of five years. Kildee could trade-in the tractor for $60,000 and buy a new tractor for $112,500. The new tractor will reduce variable manufacturing costs by $13,000 per year over its five-year useful life. Buying the new tractor will provide incremental income of $ -_- [DO not use the dollar sign, $, or a comma separator in providing your answer.]