So the NPV of the project is:
NPV = –$55,000,000 – $30,615,000/(1.11) + $4,138,180/(1.11)2 + $6,675,760/(1.11)3
The profitability index is:
PI = [–$30,615,000/(1.11) + $4,138,180/(1.11)2 + $6,675,760/(1.11)3 + $8,740,180/(1.11)4
The equation for the IRR is:
0 = –$55,000,000 – $30,615,000/(1 + IRR) + $4,138,180/(1 + IRR)2 + $6,675,760/(1 + IRR)3
Notice that we can’t use the Excel IRR function. The Excel function requires us to use all of cash
flows from the project, which is not possible with this project as the cash flows are perpetual. However,
we can use Solver or Goal Seek to find the IRR. Using the terminal cash flow value in Year 5
($137,866,788) as a cash flow in the IRR function is incorrect as the terminal cash flows have already
been discounted by the required return.
CHAPTER 8B
BETHESDA MINING