Beginning inventory, purchases, and sales data for portable DVD players are as follows: June 1 Inventory 36 units @ $71 6 Sale 29 units 14 Purchase 15 units @ $74 19 Sale 14 units 25 Sale 4 units 30 Purchase 26 units @ $77 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 4. 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.