Câu 2 (5 điểm): Annual demand for goods of X company is 8,000 units, spread evenly throughout the year. The cost of placing and receiving an order is $40. The annual carrying cost is $12 per unit. What is the size of the order X should place with its supplier to minimize its inventory cost? Calculate the carrying cost, the order cost and the total inventory cost of the firm. How the optimal order quantity and the total inventory cost would change if the carrying cost were cut in half to $6? Calculate the re-ordering point if it takes 9 days for shipping the new order (Suppose that a year has 360 days).
