SOUND Distribution markets CDS of the performing artist Marilynn. During October, SOUND made the following purchases of Marilynn's CDs. SOUND uses a periodic inventory system. Units sold during October: 12000 At the beginning of October, SOUND had an opening inventory: 20017units with a unit cost of $ Required: a. Determine the cost of goods available for sale. (2p) b. Determine the closing inventory and the cost of goods sold under the FIFO and the weighted average (AVCO) method. (12p) c. Which method would result in the higher inventory amount for the statement of financial position (balance sheet) in case of increasing purchase prices? Explain your answer. (4p)