You are planning to save for retirement over the next 30 years. To do this, you will invest $1,200 a month in a stock account and $900 a month in a bond account. The return of the stock account is expected to be 8 percent, and the bond account will pay 5 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?