2. a) You pay $78.35 for an investment that promises to pay you $100 in 5 years. What annual rate of return will you earn on this investment? b) You pay $78.35 for an investment that promises to pay you $20 every year forever. What is the implied interest rate? 3. Suppose the annual interest rate is 4%. a) What is the present value of the following uneven cash flow stream? b) What is the FV of these cash flows? 1 4 Years 4% 100 300 300 -50