Screenshots for accounting homework. Please explain answer as I am completely lost.

Problem 5-7AA Periodic: Alternative cost ows LO P1 [The following information applies to the questions displayed below.] Seminole Company began year 2013 with 23,000 units of product in its January1 inventory costing $15 each. It made successive purchases of its product in year 2013 as follows. The company uses a periodic inventory system. On December 31, 2013, a physical count reveals that 40,000 units of its product remain in inventory. Mar. 7 30,000 units @ $18 each May 25 39,000 units @ $20 each Aug. 1 23,000 units @ $25 each Nov. 10 35,000 units @ $26 each References Section Break Problem 57AA Periodic: Alternative cost flows LO P1 value: . Required information 10.00 paints Problem 5-7AA Part1 Required: 1. Compute the number and total cost of the units available for sale in year 2013. Total units available for sale 127,000 Total cost of units available for sale $ 2,805,000 10 value: Required information ' 10.00 points Problem 5-7AA Part 2 2. Compute the amounts assigned to the 2013 ending inventory and the cost of goods sold. (a) FIFO periodic Total cost of units available for sale Less ending inventory on a FIFO basis Cost of units sold (b) LIFO periodic Total cost of units available for sale Less ending inventory on a LIFO basis Cost of units sold (c) Weighted average periodic Total cost of units available for sale Less ending inventory - weighted average Cost of units sold