Assume that the business maintains a perpetual inventory system, costing by the first-in, first-but method, Determine the cost of goods sold for each sale and the inventory balance after each sale, presenting the dota in the form lilustrated in Exh bit 3. Under FIFO, if units are in inventory at fwo 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