Heidi Company is considering the acquisition of a machine that costs $549,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash inflow of...

Heidi Company is considering the acquisition of a machine that costs $549,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash inflow of $105,000, and annual operating income of $84,975. The estimated cash payback period for the machine is (round to one decimal point)?