Have some trouble with this. Compound Interest is throwing me off a bit especially when switching the interest rate to 6.5 once everything is combined. Thanks in advance.

You are planning to save for retirement over the next 30 years. you will invest $750 per month in a stock account and $350 per month in a bond account. The return of the stock account is expected to be an APR of 9.5 percent, and the bond account will earn an APR of 5.5 percent. When you retire, you will combine your money into an account with an APR of 6.5 percent. All interest rates are compounded monthly.

How much can you withdraw each month from your account assuming a withdrawal period of 25 years?