Montoure Company uses a perpetual inventory system. It entered into the following calendar-year 2013 purchases and sales transactions. Compute the cost assigned to ending inventory using (a) FIFO, (b) LIFO, (c) weighted average, and (of) specific identification. For specific identification units sold consist of 600 units from beginning inventory, 300 from the February 10 purchase, 150 from the March 13 purchase, 100 from the August 21 purchase, and 200 from the September 5 purchase. (Round your average cost per unit to 2 decimal places.) Compute gross profit earned by the company for each of the four costing methods. (Round your average cost per unit to 2 decimal places.)