a 9-year annuity of 18 $10,400 semiannual payments will begin 11 years from now, with the first payment coming 11.5 years from now. if the discount rate is 8 percent compounded semiannually, what is the value of this annuity nine years and seven years from now? do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16. what is the value of the annuity today?