N'EXPRESS is a coffee distributor that obtains its product from a single supplier. Demand is reasonably constant throughout the year, and last year the company sold 56680 tons of this product. It estimates the costs of placing an order at around 75 each time an order is placed and calculates that the annual cost of holding inventory is 20 per cent of purchase cost. The company purchases the cottee at 300 per ton. N'EXPRESS wants to assure a service level