Calculating Annuities you are planning to save for retirement over the next 30 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 12 percent, and the bond account will pay 7 percent. When you retire, you will combine your money into an account with a 9 percent return. How much can you withdraw each month from your account assuming a 25-year withdrawal period?