Hayden Company is considering the acquisition of a machine that costs $535,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash inflow of $89,000, and annual operating income of $75,650. The estimated cash payback period for the machine is (round to one decimal place) a. 7.1 years x b. 1.2 years c. 6.0 years d. 8.2 years