NIS Sound Systems, Inc. produces and sells sound systems for both home and auto. DVD players used in the assembly of NIS systems are purchased from BUN Electronics. NIS purchasing agent currently submits a purchase requisition for DVD players 13 times a year, and their order size generally remains fixed from cycle to cycle. The company's annual requirements for DVD players total 5,000 units (20 units per working day), and the cost per unit is $60. The supplier has been quite reliable with deliveries; total time between date of order and the date of receipt is 5 days. Associated with the purchase of each shipment is ordering cost. This cost, which amounts to $20 per order, includes the cost of preparing the requisition, inspecting the delivered goods, and issuing a check for payment. In addition to the ordering cost, NIS incurs inventory carrying cost that includes cost of capital, insurance, storage, handling, tax and so forth. This cost equals 10 percent of the purchase cost per unit per year. Beginning on September 2010, NIS management would like to embark on a companywide cost-control program in an attempt to improve its profits. One area to be closely scrutinized for possible cost savings is inventory management. Given this strong pressure from top management, the operations manager, Ms. Mary Jones, wants to know if there would be any possible cost savings in her area. More specially, she would like to understand how much costs could be saved from an effective inventory policy.