Perpetual Inventory Using LIFO Beginning inventory, purchases, and sales data for portable game players are as follows: Apr. 1 Inventory 66 units @ $67 10 Sale 47 units 15 Purchase 82 units @ $71 20 Sale 48 units 24 Sale 13 units 30 Purchase 37 units @ $74 The business maintains a perpetual inventory system, costing by the last-in, first-out method.