Kaitlyn deposited $23,000 into a fund at the beginning of every quarter for 19 years. He then stopped making deposits into the fund and allowed the investment to grow for 4 more years. The fund was growing at 2.55% compounded monthly.

a. What was the accumulated value of the fund at the end of year 19?

b. What was the accumulated value of the fund at the end of year 23?

c. What is the total amount of interest earned over the 23-year period?