Craig Ltd. began the month of March with 624 units in inventory with a total cost of $1.560. The company uses a perpetual inventory system and had the following transactions during the month of March: Unit Cost Total Cost Mar.7 Purchased 1.560 units $3.15/unit $4.914 Mar. 12 Purchased 1.092 units $3.25/unit $3.549 Mar. 15 Sold 860 units at $7.10/unit Mar. 21 Purchased 620 units $3.85/unit $2,387 Mar. 26 Sold 936 units at $7.10/unit