Hayden Company is considering the acquisition of a machine that costs $432,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash inflow of $92,000, and annual operating income of $78,200. The estimated cash payback period for the machine is (round to one decimal place) Oa. 5.5 years Ob. 6.7 years Oc. 47 years Od. 1.2 years