(i) (Click the icon to view the trensactions) Read the reguirements. a., b., and c. Determine the cost of goods sold and ending merchandise inventory using the (a) FIFO inventory costing method, and (c) weighted-average inventory costing method assuming Serenity Books uses the periodic inventory syst per unit to the nearest cent and all other amounts to the nearest dollar.) OA. Serenity Books has the following transactions in August related to merchandise inventory i. (bilick the icon to view the transections.) More info