Find the IRR in Excel by employing the IRR function, then use it as the discount rate that causes NPV to equal zero. 2 Use What-If analysis, a built-in calculator in Excel, to solve for the ...

Using the present value discount calculation, the discounted payback period figure is $1,000/1.04 = $961.54. Thus, after the first period, the project still requires $3,000 - $961.54 = $2,038.46 ...

Let’s assume that we didn’t calculate the IRR of 57% as we did above and have no idea what the correct discount rate is. We can use Excel’s What-If calculator in this case.