Ramson Corporation is considering purchasing a machine that would cost $544,640 and have a useful life of 9 years. The machine would reduce cash operating costs by $85,100 per year. The machine would have a salvage value of $107,140 at the end of the project. (Ignore income taxes.) Required: a. Compute the payback period for the machine. (Round your answer to 2 decimal places.) b. Compute the simple rate of return for the machine. (Round your intermediate calculations to nearest whole dollar and your final answer to 2 decimal places.) a. Payback period years b. Simple rate of return %