You are planning to save for retirement over the next 20 years. To do this, you will invest $800 a month in a stock account and $500 a month in a bond account. The return of the stock account is expected to be 9 percent, and the bond account will pay 4 percent. When you retire, you will combine your money into an account with a return of 7 percent. How much can you withdraw each month from your account assuming a 20-year withdrawal period?