he purchasing manager for Medco Research Laboratory orders letterhead forms and stationery from an office products firm in boxes of 500 sheets. The company uses 5,000 boxes per year. Annual carrying costs are $4.50 per box, and ordering costs are $34. The following all unit discount price schedule is provided by the office supply company: Order Quantity (boxes) Price per Box 200–999: $13 1,000–2,999: $12 3,000–4,999: $11 5,000 : $10 Determine the optimal order quantity and the total annual inventory cost.