The inventory data for an item for November are: 11/01 Inventory 11/04 Sold 11/10 Purchased 11/17 Sold 11/30 Purchased 20 units at $20 10 units 30 units at $21 20 units 10 units at $22 Using the perpetual system, costing by the last-in, first-out method, what is the cost of the ending merchandise inventory of 30 units on November 307 A $640 B. $630 C. $660 D. $610