R$.$ C$.$ Barker makes purchasing decisions for his company. One product that he buys costs $$50$ per unit when the order quantity is less than $500.$ When the quantity ordered is $500$ or more, the price per unit drops to $$48.$ The ordering cost is $$30$ per order and the annual demand is $7,500$ units. The holding cost is $10$ percent of the purchase cost. If R$.$ C$.$ wishes to minimize his total annual inventory costs, he must evaluate the total cost for two possible order quantities.

Determine question $1$ to $3$ based on this question:

What are these two possible Optimal order quantities $($EOQ$)?($Round answer to nearest unit$)$