4. A financial manager at Textbook Brokers, Inc. has estimated that it costs $15 to place an order from a major publisher. Further, she estimates that it costs $0.25 to hold each book. Textbook Brokers sells 225,000 books each year. In the past, the firm has ordered 4,000 books per delivery run. Calculate the difference in the total inventory cost (per period) if the firm moves from an order quantity of 4,000 books to the economic order quantity (i.e., EOQ). (10 points) D/DC