Which of the following statements is$$ FALSE?

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Part $1$

A$.$

If you are unsure of your cost of capital$$ estimate, it is important to determine how sensitive your analysis is to errors in this estimate.

B$.$

About$75\%$ of firms surveyed used the NPV rule for making investment decisions.

C$.$

To decide whether to invest using the NPV$$ rule, we need to know the cost of capital.

D$.$

NPV is positive only for discount rates greater than the internal rate of return.