Heidi Company is considering the acquisition of a machine that costs $364,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash inflow of $124,000, and annual operating income of $84,058. The estimated cash payback period for the machine is (round to one decimal point)?

a. 4.3 years

b. 2.9 years

c. 4.0 years

d. 4.5 years