Perpetual Inventory Using AFO Beginaing inventory, purchases, and saies data for DVD players are as follows: The business maintains a perpetual inventory system, costing by the first-in, first-out method. a. Determine the cost of the goods sold for each sale and the inventory balance after each sale, presenting the data in the form lifustrated in Exhibir 3. Under FIFO, if units are in inventory at two different costs, enter the units with the LowER unit cost first in the Cost of Goods Sold Unit Cost column and in the Inventary unit Cost for each sale and the inventory balance after each sale, presenting the data in the form column