Beginining imventory, purchases, and solks datk for prepaid cell phones for December are as follows: Inventory Deci, 1420 units at $40 Purchases Dec, 10210 units at $42 20189 units at $44 Sales Dec. 12294 units 14252 units 31.126 units Assume that the business maintains a perpetual inventory system, costing by the first-in, first-out method. Determine the cost of goods sold for each sale and the inventory balance after each sale, presenting the data in the form illustrated in 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