Ramsey Sdn. Bhd. operate a business dealing with buying and selling merchandise. The company's five months of trading showed the following purchases and sales. Required: (a) Calculate the closing inventory as at 30 November 2022 using the first-in first-out (FIFO) valuation method. (b) Calculate the closing inventory as at 30 November 2022 using the last-in first-out (FIFO) valuation method. (c) Calculate the closing inventory as at 30 November 2022 using the average (AVCO) inventory valuation method