Current Attempt in Progress Pronghorn Inc. uses a perpetual inventory system. Its records show the following for the month of May. Calculate the cost of goods sold for May and the ending inventory at May 31 using the average cost formula. (For average, use 3 decimal places, e.g. 15.235 in your calculations and round final answers to 3 decimal places, e.g 5.255.) Date Units 30 Unit Cost $9 Total Cost $270 1 Cost of goods sold $ Explanation Inventory Purchase Sale Purchase 24 10 May May May May 240 15 18 24 (43) 36 11 396 Ending Inventory $ Total 90 $906