3. The weekly demand for an item is normally distributed with a mean of 220 units per week and a standard deviation of 13 units per week. The lead time for this item is 2 weeks. The company works 52 weeks a year. Each unit of this item costs 25, the annual holding cost is 19% of the unit cost, and the reorder cost is 45. The company has set a service level for this item of 90%. Determine the following for this item: 3.1. The reorder level; 3.2. The quantity to order at a time; 3.3. The total cost of inventory