The Queens Box Company experiences a constant demand of 48,000 boxes per year to operate its business. The unit cost is 30 (cents). Placing an order costs $20 and annual carrying costs are $2/unit The company operates 250 days per year and maintains a safety stock of 576 boxes. The lead time for an order of boxes is 4 business days. The EOQ (rounded to the nearest whole number) is:
a. 576 units
b. 490 units
c. 3098 units
d. 980 units