I do not understand how to calculate the ending merchandise inventory as well as the cost of goods sold so if someone could walk me through it step by step, it would be greatly appreciated.

10A. Unique Books has the following transactions in August related to merchandise inventory. (Click the icon to view the transactions.) a. b. Determine the cost of goods sold and ending merchandise inventory using the FIFO inventory costing method assuming Unique Books uses the periodic inventory system. Determine the cost of goods sold and ending merchandise inventory using the LIFO inventory costing method assuming Unique Books uses the periodic inventory system. Determine the cost of goods sold and ending merchandise inventory using the weighted average inventory costing method assuming Unique Books uses the periodic inventory system. c. a., b., and c. Determine the cost of goods sold and ending merchandise inventory using the (a) FIFO inventory costing method, (b) LIFO inventory costing method, and (c) weighted average inventory costing method assuming Unique Books periodic inventory system. (Round weighted average cost per unit to the nearest cent and all other amounts to the nearest dollar.) a. FIFO More Info Beginning merchandise inventory 195 361 Plus: Net cost of purchases Cost of goods available for sale Less: Ending merchandise inventory 556 Aug. 1 Beginning merchandise inventory, 15 books @ $13 each 3 Sold 4 books @ $17 each 12 Purchased 13 books @ $17 each 15 Sold 14 books @ $17 each 20 Purchased 7 books @ $20 each 28 Sold 8 books @ $24 each Cost of goods sold Print Done