A firm has an average inventory of 4,000 units. The carrying cost per unit per year is 8¢. The firm places an order for 9,000 units on the first of each month and the order cost is $60. What is the economic order quantity (EOQ)?
A) 9,655 units
B) 11,904 units
C) 12,728 units
D) 13,573 units
E) 15,600 units