See below

select one of the following methods (P1 Payback period, P2 Accounting rate of return, P3 Net present value or P4 Internal rate of return) and briefly discuss how the method can be used to solve a present day financial or business problem. 

I just need at least 2 paragraps explaining how ONE of these methods (P1-P4 pick one) can be used to solve a present day financial or business problem.