13. Susan and Jeff each make deposits of 175 at the end of each year for 25 years. Starting at the end of year 26, Susan makes annual withdrawals of X for 20 years and Jeff makes annual withdrawals of Y for 20 years. Both funds have a balance of O after the last withdrawal. Susan's fund earns an annual effective interest rate of 5.5%. Jeff's fund earns an annual effective interest rate of 8.2%. Calculate Y-X