E6-5 During the year, Triumph Incorporated has the following inventory transactions. For the entire year, the company sells 81 units of inventory for $30 each. Required: 1. Using FIFO, calculate (a) ending inventory, (b) cost of goods sold, (c) sales revenue, and (d) gross profit. 2. Using LIFO, calculate (a) ending inventory, (b) cost of goods sold, (c) sales revenue, and (d) gross profit. 3. Using weighted-average cost, calculate (a) ending inventory, (b) cost of goods sold, (c) sales revenue, and (d) gross profit. 4. Determine which method will result in higher profitability when inventory costs are declining