Problem 15.27 Susan and Jeff cach make deposits of 100 at the end of cach ycar for 40 ycars. Starting at the end of the 41st ycar, Susan makes annual withdrawals of X for 15 ycars and Jeff makes annual withdrawals of Y for 15 ycars. Both funds have a balance of 0 aftcer the last withdrawal. Susan's fund carns an annual effective interest rate of 8%. Jeff's fund carns an annual effective interest rate of 10%. Calculate y-x