You intend to save for retirement over the upcoming $30$ years by allocating R$850$ monthly to a stock account and R$250$ monthly to a bond account. The expected return for the stock account is $11\%,$ while the bond account is anticipated to yield $6\%.$ Upon retirement, you plan to merge your funds into an account with a $5\%$ return. All interest rates are Annual Percentage Rates $($APRs$)$ compounded monthly. What would be the monthly withdrawal amount from your account over a

$25-$year period post$-$retirement?