Brad and Wendy put $1,800 into a college fund every year for their son, Jack, on his birthday, with the first deposit one year from his birth (at his very first birthday). The college fund has a guaranteed annual growth or interest rate of 4.15%. At his eighteenth birthday, they will pay the last $1,800 into the fund. How much will be in the college fund for Jack immediately following this last payment?
must show work