(28 points) Question 3. A firm has the following transactions with its product R. 1 January 20X1 Opening inventory: nil 1 February 20x1 Buys 10 units at $300 per unit 11 February 20x1 Buys 12 units at $250 per unit 1 April 20x1 Sells 8 units at $400 per unit 1 August 20x1 Buys 6 units at $200 per unit 1 December 20x1 Sells 12 units at $400 per unit Calculate and write down solutions (i) ending inventory, (ii) cost of goods sold, (ii) gross profit, under each of the following methods: -) FIFO