Perpetual inventory using Lfo: The following units of a particular item were avallable for sale during the calendar year: The firm maintains a perpetual inventory system. Determine the cost of goods sold for each sale and the inventory balance after each sale, assuming the last-in, first-out methed. Ahenent the fata in ine Illustrated in Exhibit 4. Under Lro, if units are in inventery at two or mere different costs, enter the units with the Lowrg unit cost first in the Inventory unit Cost column