A truck maintenance facility uses a weekly order interval in a period model. It has annual demand of 36000 gallons of motor oil and operates 360 days per year. The lead time from placement of an order for motor oil until delivery is 2 days and the standard deviation of daily usage is 16 gallons. Use z=0.8416 for an 80% service level and determine the appropriate order quantity if 42 gallons are currently on hand. 42 gallons 941 gallons 899 gallons 900 gallons