Can you please explain step by step for Part A and Part B?

9 1 points The inventory records of Cushing Inc. reflected the following information for the year ended December 31, 2019: Number Unit Total of Units Cost Cost Inventory, January 1 200 $ 14.0 $ 2,800 Purchases: May 30 320 15.0 4,800 September 28 400 17. 6,888 Goods available for sale 92e $ 14,480 Sales: April le (140) June 11 (300) November 1 (380) Inventory, December 31 100 eBook Print References Required: a. Assume that Cushing, Inc., uses a periodic inventory system. Calculate cost of goods sold and ending inventory under FIFO and LIFO. FIFO LIFO Cost of goods sold Ending inventory b. Assume that Cushing, Inc., uses a perpetual inventory system. Calculate cost of goods sold and ending inventory under FIFO and LIFO. FIFO LIFO Cost of goods sold Ending inventory c. Is there a change in cost of goods sold and ending inventory in parts a and b under LIFO. O Yes O No d. The results from the LIFO periodic calculations in part a cannot possibly represent the actual physical flow of inventory items. True O False