The following units of a particular item were available for sale during the calendar year: Jan. 1 Inventory 4,100 units at $39 Apr. 19 Sale 2,500 units June 30 Purchase 4,600 units at $45 Sept. 2 Sale 4,900 units Nov. 15 Purchase 2,000 units at $47 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 method. Present the data in the form illustrated in Exhibit 4. Under LIFO, if units are