Answer:
Payback = 4 years
Explanation:
If a project has equal annual cash-flows, the payback period can be calculated using the formula:
[tex]Payback=\frac{CostOfMachine}{AnnualCashflows}[/tex]
The reduction in operating costs resulting from the purchase of the machine is treated as cash inflows for capital investment decisions. As such, annual cash inflows to be used in the formula above =$15,000 each year.
[tex]Payback=\frac{60,000}{15,000}=4years[/tex]
It will take the company 4 years to recover the initial investment.