6-7 (similar to) HW SC OA. Happy Books has the following transactions in August related to merchandise inventory 1 (Click the icon to view the transactions.) a. Determine the cost of goods sold and ending merchandise inventory using the FIFO inventory costing method assuming Happy Books uses the periodic inventory system b. Determine the cost of goods sold and ending merchandise inventory using the LIFO inventory costing method assuming Happy Books uses the periodic inventory system c. Determine the cost of goods sold and ending merchandise inventory using the weighted-average inventory costing method assuming Happy Books uses the periodic inventory system 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 in method assuming Happy Books uses the periodic inventory system (Round weighted average cost per unit to the nearest cont and all other amounts to the nearest dolar.) FIFO More Info Beginning merchandise inventory Plus: Netcost of purchases $12 each Choose from any list or enter any number in the input fields and then click Check Answer. Aug 1 Beginning marchandise inventory. 15 books 3 Sold 5 books 517 each 12 Purchased 13 books $14 each 15 Sold 13 books $17 each 20 Purchased 5 books 315 each 28 Sold 6 books $24 Bach 2 parts Clear All 2 remaining