Open Rec Limited ('ORL') uses the perpetual inventory system and the weighted average cost method. Below is ORL's record of inventory purchases and sales for the month of October 202. Required: 1 Calculate the sales revenue, cost of goods sold, and gross profit of ORL for October 20x2. (10 marks) FIFO costing method instead. (4 marks) 3 Discuss whether the cost of goods sold and ending inventory of costing method instead. Briefly explain why. (6 marks)