4. Consider the following one year investments : Investment Cash Flowtal Cash Flow to - 10,000 +18,000 2 - 5,000 9,000 3 - 5,000 + 5.700 2,000 + 4.000 a. Calculate the NPV and rate of return for each of these investments. The opportunity cost of capital is 20+ for all tour investments b. Which investment is most valuable? c. Suppose the firm can only take one of these investments Which investment should the firm choose? and their cash flow