The business maintains a perpetual inventory system, costing by the first-in, fist-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 in Extibit 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 5 old Unit Cost column and in the Inventory Unit Cost column