Problem:

You are planning to save for retirement over the next 25 years. To do this, you will invest $790 a month in a stock account and $390 a month in a bond account. The return of the stock account is expected to be 9.9 percent, and the bond account will pay 5.9 percent. When you retire, you will combine your money into an account with an 6.9 percent return.

Required:

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

Note: Please show how you came up with the solution.