2. Compute the number of units in ending inventory. 3. Compute the cost assigned to ending inventory using (a) FIFO, (b) LIFO, (c) weighted average and (d) specific identification. For specific identification, (round your average cost per unit to 2 decimal places ) 4. Compute gross profit earned by the company for each of the four costing methods (round your average cost per unit to 2 decimal places.)