If a garden center is considering the purchase of a new tractor with an initial investment cost of $117,000, and the center expects a return of $31,000 in year one, $22,000 in years two and three,...

If a garden center is considering the purchase of a new tractor with an initial investment cost of $117,000, and the center expects a return of $31,000 in year one, $22,000 in years two and three, $17,000 in years four and five, and $8,000 in year six and beyond, what is the payback period?

fill in the blank 1 years