BSU Inc. wants to purchase a new machine for $41200 excluding $1400 of install

BSU Inc. wants to purchase a new machine for $41200 excluding $1400 of installation costs. The old machine was bought five years ago and
had an expected economic life of 10 years without salvage value. This old machine now has a book value of $2200 and BSU Inc. expects to sell it for that
amount. The new machine would decrease operating costs by $9000 each year of its economic life. The straight-line depreciation method would be used for the
new machine for a six-year period with no salvage value.

(Using the Present value of an annuity of 1 table) Determine the cash payback period.