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. Date Quantity Cost per unit Selling price per unit Description (kg) (OMR) (OMR) April 1 Beginning inventory 300 2 Sale 250 ? 20 40 Purchase 100 22 S 120 Sale ? 40 6 Purchase 180 11 24 Sale 160 ? 42 18 23 20 ? Purchase return of 11th dated purchase 25 44 . 28 Sale Sales return of 18th dated sale 5 ? 30 42 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 physical counting of inventory