A company deposited $5,500 into an investment fund at the beginning of every quarter for 6 years. It then stopped making deposits into the fund and allowed the investment to grow for 5 more years. The fund was growing at 5.50% compounded monthly.

a. What was the accumulated value of the fund at the end of 6 years ?

b. What was the accumulated value of the fund at the end of 11 years ?

c. What was the amount of interest earned over the 11-year period?