Payback Method: Unadjusted Rate of Return. Plastics, Inc., is considering the purchase of a $40.000 machine, which will be depreciated on a straight-line basis over an eight-year period, with no salvage value. The machine is expected to generate net cash income of $12,000 per year. Determine the following:

a. Payback period.

b. Unadjusted rate of return on the initial investment. (AICPA adap