You are planning to save for retirement over the next 20 years. To do this, you will invest $600 a month in a stock account and \$300 a month in a bond account. The return of the stock account is expected to be 11 percent, and the bond account will pay 6 percent. When you retire, you will combine your money into an account with a return of 9 percent. How much can you withdraw each month from your account assuming a 20-year withdrawal period