You are planning to save for retirement over the next 25 years. To do this, you will invest $900 a month in a stock account and $600 a month in a bond account. The return of the stock account is expected to be 9 percent, and the bond account will pay 5 percent. When you retire, you will combine your money into an account with an 7 percent return. Assuming a 20-year withdrawal period, you can withdraw $____ each month from your account.