Perpetual Inventory Using LIFO Beginning inventory, purchases, and sales data for portable game players are as follows: 37 units @ $94 Apr. 1 Inventory 10 Sale 30 units 15 Purchase 46 units @ $99 20 Sale 24 Sale 30 Purchase 26 units 6 units 21 units @ $104 The business maintains a perpetual inventory system, costing by the last-in, first-out method.