Hayden Company is considering the acquisition of a machine that costs $468,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash inflow of $95,000, and annual operating income of $80,750. The estimated cash payback period for the machine is (round to one decimal place) a. 5,8 years b. 4.9 years c. 1.2 years d. 7.0 years