Montoure Company uses a perpetual inventory system. It entered into the following calendar-year purchases and sales transactions. Date Activities Units Acquired at Cost Units sold at Retail January 1 Beginning inventory 600 units $45 per unit February 10 Purchase 400 units $42 per unit March 13 Purchase 200 units $27 per unit March 15 Sales 800 units @ $75 per unit August 21 Purchase 100 units @ $50 per unit September 5 Purchase 500 units # 546 per unit September 10 Sales 600 units $75 per unit Totals 1,800 units 1,400 units Required: 1. Compute cost of goods available for sale and the number of units available for sale. Cost of goods available for sale Number of units available for sale units 2. Compute the number of units in ending inventory Ending Inventory units 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.) FIFO LIFO Weighted Average Specific Identification Sales Less: Cost of goods sold Gross profit $ 0$ 0 $ OS 0