The inventory data for an item for November are: Nov. 1 Inventory 20 units at $20 4 Sold 10 units 10 Purchased 30 units at $21 17 Sold 20 units 30 Purchased 10 units at $22 Using the perpetual system, costing by the firs-in, first-out method, what is the cost of the merchandise inventory of 30 units on November 30? a. $640 b. $610 c. $620 d. $630 The inventory data for an item for November are: Nov. 1 Inventory 20 units at $20 4 Sold 10 units 10 Purchased 30 units at $21 17 Sold 20 units 30 Purchased 10 units at $22 Using the perpetual system, costing by the last-in, first-out method, what is the cost of the merchandise inventory of 30 units on November 30? a. $640 b. $610 c. $620 d. $630