4. (Required) Post-class 4 20 20(1-5%) 20 (1 + 5%)*** 0 1 2 3 n Question: If the risk-free interest rate is 8%, what is the present value at Time 0 of all the above future cash flows. 5 (Required) Post-class 5 Joe will receive a 15-year annuity of 1000 per year, beginning at date 1. If the risk-free interest rate is 10 percent, what is the present value of his annuity? 6. (Required) Post-class 6 Joe will receive a 50-year annuity of 2000 per year, beginning at date 1. If the risk-free interest rate is 2 percent, what is the present value of his annuity