Case-4: Ibra Trader uses the perpetual inventory system. All sales returns from customers result in the goods being returned to inventory. Assume that there are no credit transactions and the inventory returned is not damaged. You are provided with the following information of the company for the month of April 2020 Quantity Cost per unit Selling price per unit Date Description (kg) (OMR) (OMR) April ! Beginning inventory 200) 20 2 Purchase 120 22 S Purchase return of 20 dated 10 22 purchase Sale 240 ? 40 6 Purchase 80 24 11 Sale 150 ? 42 18 Purchase SO 25 23 Sale 30 ? 44 28 Sales return of 28th dated sale 10 ? 44 30 Question - 4: a. You are required to calculate units and cost of goods sold; units and cost of ending inventory: and gross profit for each of the following cost flow assumptions. i. FIFO, and (3.5 Marks) ii. LIFO (3.5 Marks) b. Write any three control procedures to be followed over inventories