Bill’s Bird Feed sees weekly, average demand of 18 units for its special bird feeder that is normally distributed with a standard deviation of weekly demand of 5 units. Orders are placed thirteen times in regular intervals over the course of the year. As a special order item, the lead time is particularly long at 5 weeks. Assume the z value for the desired Service Level = 1.8. If 39 units are already in transit from the supplier, what is the Order Quantity Q?