Answer:
4.62 years
8.02%
Explanation:
The payback period is the number of years it would take the investment to recoup itself.
Payback=initial capital outlay/annual cash flow
initial capital outlay is the cost of the new machine plus installation cost minus the salvage value of the old machine.
initial capital outlay=$40,070+$1,200-$2,000=$ 39,270.00
Annual cash flow is the reduction in operating costs of $8,500 per year
payback =$ 39,270.00/$8,500.00=4.62 years
The internal rate of return is computed in the attached