Final answer:
Use Excel's IRR function to find the Internal Rate of Return and NPV function to calculate Net Present Values. The Profitability Index is calculated by the PV of cash flows divided by the initial investment, aiding in investment comparison and selection.
Step-by-step explanation:
To calculate the Internal Rate of Return (IRR) for the three investments using Excel, you can use the IRR function. Input each investment’s cash flows in a separate column and apply the function to that column. For calculating the net present value (NPV), use the NPV function with the respective cost of capital for each investment and add the initial investment manually since it’s not included by the function itself. The relationship between NPV and cost of capital is inverse; higher costs of capital will result in lower NPVs. To determine which investment to choose based on NPVs calculated using the given cost of capitals or the IRRs, select the one with the highest NPV.
For the Profitability Index (PI) questions, the PI is found by dividing the present value of future cash flows by the initial investment. To find specific values such as the total present value or initial investment when you have the other variables, manipulate the PI formula accordingly. For example, to find the sum of PVs from a given PI and investment cost or to calculate how much potential NPV is lost when choosing one investment over another, rearrange the formula to solve for the desired variable.
To deal with multiple IRRs and determine the range of costs of capital yielding a positive NPV, utilize graphical representation or iteration methods in Excel. Choose between two practically similar investments based on their IRRs and NPVs by evaluating the cost of capital in relation to these metrics, selecting the one that maximizes NPV at the existing cost of capital.