Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales data for portable DVD players are as follows: Apr. 1 Inventory 62 units @ $67 10 Sale 51 units 15 Purchase 30 units @ $70 20 Sale 18 units 24 Sale 14 units 30 Purchase 39 units @ $74 The business maintains a perpetual inventory system, costing by the first-in, first-out method. Determine the cost of the merchandise sold for each sale and the inventory balance after each sale, presenting the data in the form illustrated in Exhibit 3. a. Under FIFO, if units are in inventory at two different costs, enter the units with the LOWER unit cost first in the Cost of Merchandise Sold Unit Cost column and in the Inventory Unit Cost column.