Future Value of an Ordinary Annuity (Challenge Problem) 8-45. It is the beginning of the quarter and you intend to invest $750 into your retirement fund at the end of every quarter for the next thirty years. You are promised an annual interest rate of 8 percent, compounded quarterly. a. How much will you have after thirty years upon your retirement? b. How long will your money last if you start withdrawing $9,000 at the end of every quarter after you retire