Petromax Enterprises uses a continuous review inventory control system for one of its SKUs. The following information is available on the item. The firm operates 48 weeks in a year. Refer to the standard normal table for z-values.

Demand= 83,200 units/year

Ordering cost = $38.00/order

Holding cost = $2.50/unit/year

Average lead time = 4 weeks

Standard deviation of weekly demand = 250 units

a.) The economic order quantity for this item Is _____ units.

b. If Petromax wants to provide a 90% service level, the safety stock is ____ units.