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