FIFO and LIFO periodic inventory methods. The Rock Shop shows the following data related to an item of inventory: Inventory, January 1 200 units @ $5.00 Purchase, January 9 600 units @ $5.40 Purchase, January 19 140 units @ $6.00 Inventory, January 31 200 units Instructions (a) What value should be assigned to the ending inventory using FIFO? (b) What value should be assigned to cost of goods sold using LIFO