(Present value of complex cash flows) You have an opportunity to make an investment that will pay $100 at the end of the first year, $500 at the end of the second year, $500 at the end of the third year, $400 at the end of the fourth year, and $300 at the end of the fifth year. a. Find the present value if the interest rate is 8 percent. (Hint: You can simply bring each cash flow back to the present and then add them up. Another way to work this problem is to either use the = NPV function in Excel or to use your CF key on a financial calculator-but you'll want to check your calculator's manual before you use this key. Keep in mind that with the = NPV function in Excel, there is no initial outlay. That is, all this function does is bring all the future cash flows back to the present. With a financial calculator, you should keep in mind that CF is the initial outlay or cash flow at time 0, and, because there is no cash flow at time 0, CF = 0.) b. What would happen to the present value of this stream of cash flows if the interest rate were zero percent