Bank Drugs sells Jami Michelle lipstick. Jami Michelle Company offers a $6\%$ discount on orders of at least $500$ tubes, a $10\%$ discounton orders of at least $1,000$ tubes, a $12\%$ discount on orders of at least $1,800$ tubes, and a $15\%$ discount on orders at least $2,500$ tubes.

Bank sells an average of $42$ tubes of Jami Michelle lipstick weekly. The normal price paid by Bank Drugs is $$1$ per tube. If it costs Bank $$42$ to place an order, and Bank's annual holding cost rate is $29\%,$ determine the optimal order policy for Bank Drugs. $($Assume the store is open $52$ weeks per year. Round your answer to the nearest whole number.$)$