Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions for March. (For specific identification, units sold consist of 80 units from beginning inventory, 340 units from the March 5 purchase, 40 units from the March 18 purchase, and 120 units from the March 25 purchase. Date Activities Mar. 1 Beginning inventory Units Acquired at Cost 100 units @ $50 per unit Units Sold at Retail Mar. 5 Purchase .. 400 units @ $55 per unit Mar. 9 Sales.... 420 units @ $85 per unit Mar. 18 Purchase. 120 units @ $60 per unit Mar. 25 Purchase. 200 units @ $62 per unit Mar. 29 Sales.... Totals. 820 units 160 units @ $95 per unit 580 units Required 1. Compute cost of goods available for sale and the number of units available for sale. 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. (Round all amounts to cents.) 4. Compute gross profit earned by the company for each of the four costing methods in part 3.