For product W, a firm has an annual holding cost percentage of 20% of unit price, an ordering cost of $110 per order, and annual demand of 15,000 units. The following price schedule applies to the firm's purchases. Price Per Unit Units Ordered 1-250 251-500 501-750 751-1000 $30.00 $28.00 $26.00 $25.00 What is the optimal order quantity? Round your answer to the nearest whole number 696 501 812 251 751