10A. Happy Books has the following transactions in August related to merchandise inventory. (Click the icon to view the transactions.) Read the requirements. a., b., and c. Determine the cost of goods sold and ending merchandise inventory using the (a) FIFO inventory c inventory costing method assuming Happy Books uses the periodic inventory system. (Round weighted average Aug.1 Beginning merchandise inventory,11 books@\$21 each Aug.3 Sold4books@\$16 each Aug.12 Purchased9books@\$25 each Aug.15_Sold8books@\$16 each Aug.20 Purchased3books@S28 each Aug.28_Sold4books@\$17 each