QUESTION 4 (17 marks) The table below shows the beginning inventory, purchase and sales of the Gypsum company's inventories. single product over the financial year 2019. Gypsum uses the perpetual inventory system for all Date Description Units Cost Jan 1 Opening balance 150 $10.00 Jan 1 Purchases 400 $11.00 Jan 2 - Jun 30 Sales 350 Jul 1 Purchases 500 $15.00 Jul 2 - Dec 31 Sales 450 Required: Determine the following, as of December 31, 2019: Show your workings. a) First-In. First-Out (FIFO) Cost of Goods Sold (4 marks) Ending Inventory (2 mark) b) Last-In, First-Out (LIFO) i) Cost of Goods Sold (2 marks) Ending Inventory (3 marks) C) Average Method (round your average cost to the nearest cent) Cost of Goods Sold (4 marks) ii) Ending Inventory (2 marks)