Curious on how to do this problem, explanation is helpful too. Thanks!

The following data was obtained from the inventory records of Moore Company which started operations on January 1, 2020: Jan. 1: 30 units @ $40 May 1: 50 units @ $42 Nov.1: 20 units @ $48 A physical count of the inventory on December 31, 2020 indicated 35 units remain. REQUIRED: Calculate both Cost of Goods Sold and Ending Inventory under the three methods of periodic inventory costing: CGS EI FIFO LIFO AVERAGE COST