You are planning for retirement, and expect to work for the coming 35 years. After that, you hope to enjoy a retirement period of 25 years. You estimate that you can save $500 at the end of each month during your working years, and that all your investments will earn a return of 6.50% over the entire planning period of 60 years. What is the most that you would be able to withdraw at the start of each month during your retirement?