this is a quantitative analysis question

Salim hypermarket sells light bulbs, and the annual demand for the bulbs is 4500 units. The supermarket's current policy is to order 500 units of bulbs each time an order is placed. The bulbs cost the hypermarket RM15 each, while the annual holding cost for the inventory is 3% of the unit cost. The hypermarket is open for business 250 days a year. The ordering cost is estimated to be RM25 per order. It takes four days for the order to arrive. The supplier makes an offer to give discounts for mantity numanaca nn a.. below. Determine whether the supermarket should take advantage of the offer. If so, what is the optimal order quantity