Heidi Company is considering the acquisition of a machine that costs $347,000. The machine is expected to have a useful life of 6 years, a negligible residual value, an annual net cash inflow of $104,000, and annual operating income of $86,688. The estimated cash payback period for the machine is (round to one decimal point) a. 4.0 years b. 3.3 years c. 4.5 years d. 4.0 years The expected average rate of return for a proposed investment of $680,000 in a fixed asset, with a useful life of 4 years, straight-line depreciation, no residual value, and an expected total net income of $247,000 for the 4 years, is (round to two decimal points) a. 18.16% b. 13.90% c. 9.08% d. 36.32%