You are planning to save for retirement over the next 25 years. To do this, you will invest $850 per month in a stock account and $450 per month in a bond account. The return of the stock account is expected to be 10.5 percent, and the bond account will pay 6.5 percent. When you retire, you will combine your money into an account with a 7.5 percent return.

How much can you withdraw each month from your account assuming a 20-year withdrawal period?