7. Calculating Present Value of a Perpetuity) Given an interest rate of 6.2 percent per year, what is the value at date t=7 of a perpetual stream of $3,500 payments that begins at date t=15?

8. Calculating Present Values) A 5-year annuity of ten $7,000 semiannual payments will begin 8 years from now, with the first payment coming 8.5 years from now. If the discount rate is 10 percent compounded monthly, what is the value of this annuity five years from now? What is the value three years from now? What is the current value of the annuity?