Perpetual Inventory Using FIFO Beginning inventory, purchases, and sales data for DVD players are as follows: 44 units at $78 Purchase November 1 Inventory 10 Sale 15 20 Sale 24 Sale 30 Purchase 37 units 21 units at $83 15 units 9 units 27 units at $86 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 illustrated Exhibit 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 Inventory Unit Cost column.