PA7.4 (Algo) (Supplement 7A) Analyzing the Effects of the LIFO Inventory Method in a Perpetual Inventory System [LO 7-S1] Gladstone Company tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing method at the time of each sale, as if it uses a perpetual inventory system. Assume its accounting records provided the foliowing information at the end of the annual accounting period, December 31. 1. Calculate the cost of goods sold and ending inventory for Gladstone Company assuming it applies the LIFO cost method perpetually at the time of each sale