The inventory data for February are: Feb 1 Inventory 20 units @$20 4 Sold 10 units 10 Purchased 30 units @ $21 17 Sold 20 units 29 Purchased 10 units @ $22 Using the perpetual system, costing by FIFO method, what is the cost of the merchandise inventory of 30 units in February 29? $640 O $610 O $620 O $630