You are planning to save for retirement over the next $40$ years. To do this, you will invest $$900$ per month in a stock account and $$500$ per month in a bond account. The return of the stock account is expected to be $8$ percent per year $($compounded monthly$),$ and the bond account will pay $6$ percent per year $($compounded monthly$).$ When you retire, you will combine your money into an account with a $4$ percent per year return $($compounded monthly$).$ How much can you withdraw each month from your account assuming a $25-$year withdrawal period?