E7-18 (Algo) (Supplement 7A) Calculating Cost of Ending Inventory and Cost of Goods Sold under Perpetual FIFO and LIFO [LO 7-S1] Orion Iron Corporation tracks the number of units purchased and sold throughout each year but applies its inventory costing method perpetually at the time of each sale, as if it uses perpetual inventory system. Assume its accounting records provided the following information at the end of the annual accounting period, December 31 . Required: Calculate the cost of ending inventory and the cost of goods sold using the FIFO and LIFO methods