Hayden Company is considering the acquisition of a machine that costs $422,000. The machine is expected to have a useful life of six years, a negligible residual value, an annual net cash flow of $93,000, and annual operating income of $79,050. What is the estimated cash payback period for the machine (round to one decimal points)? n. 1.2 years 1.6.5 years c. 4.5 years d.5.3 years