I understand part A (I think?) and I filled out all of the info there but I don't understand B and C. Please help. Below is the format that it has to be answered in:

P6-3B Smythe Company Inc. had a beginning inventory of 200 units of Product ERV at a cost of $6 per unit. During the year, purchases were Determine cost of goods sold and ending inventory using FIFO LIFO, and average-cost in a periodic inventory system and assess financial statement effects Jan. 24 Apr. 12 800 units at $7 400 units at $8 Aug. 19 Nov. 30 600 units at $9 350 units at $10 Smythe Company uses a periodic inventory system. Sales totalled 1,900 units (LO 2). AP Instructions (a) Determine the cost of goods available for sale (b) Determine the ending inventory and the cost of goods sold under each of the (b) Cost of goods sold: FIFO $14,500 LIFO $15,950 Average $15,281 assumed cost flow methods (FIFO, LIFO, and average-cost). Prove the accuracy of the cost of goods sold under the FIFO and LIFO methods. (Round average unit cost to three decimal places.) (c) Which cost flow method results in the lowest inventory amount for the balance sheet? The lowest cost of goods sold for the income statement