What is the NPV of the following cash flows at a discount rate of zero percent? What if the discount rate is 10 percent? If it is 20 percent? If it is 30 percent? Complete the following analysis. Do not hard code values in your calculations. You must use the built-in Excel function to answer this question. Complete the following analysis. Do not hard code values in your calculations. You must use the built-in Excel function to answer this