- En Sores revenue Of AED 500,000, and cost of goods sold totaled AED 300,000. Calculate its gross profit percentage to the nearest ong decimal. 4. A company purchased 500 units for AED 30 each on January 31. It purchased 550 units for AED 33 each on February 28. It sold a total of 650 units for AED 45 each from March 1 through December 31. What is the cost of ending inventory on December 31 if the company uses the 5. Assuming that costs are changing during the accounting period, under the last-in, first-out Inventory costing method, the amount of cost of goods sold calculated using the perpetual inventory system will usually differ o r stay the same from the amount calculated using the periodic inventory system