Please answer the question in a way that a new student can understand. someone previously answered the question in a way I could not seperate answer from work to arrive at that answer.

Problem III The following data was obtained from the inventory records of Moore Company which started operations on January 1, 2019: Jan. 1: 30 units @ $40 May 1: 50 units @ $42 Nov.1: 20 units @ $50 A physical count of the inventory on December 31, 2019 indicated 35 units remain. REQUIRED: Calculate both Cost of Goods Sold and Ending Inventory under the three methods of periodic inventory costing: CGS FIFO LIFO AVERAGE COST