I've been stuck on this assignment for hours. Any help is so greatly appreciated

Amazon.com Inc

Using the companys 10-K answer the following questions is an essay format:

• Identify the inventory costing method Amazon uses. Is this the common and appropriate method used in the industry?
• The reported inventories for the two most recent years.
• Compute the dollar amount change and percentage change in inventories between the two most recent years on the financial statements.
• The reported amounts for cost of sales (or cost of goods sold) for the two most recent years.
• Compute the ratio of cost of sales to net sales for the two most recent years. Interpret the ratio and discuss the implications of the changes in the ratio for the two years.
• Compute inventory turnover for the two most recent years. Use cost of goods sold or cost of sales and inventories. Interpret the ratio and discuss the implications of the changes in the ratio for the two years.
• Compute days in inventory. Interpret the ratio and discuss the implications of the changes in the ratio for the two years.
• What conclusions can Amazons management draw from these data ratios computed above?

http://phx.corporate-ir.net/phoenix.zhtml?c=97664&p=irol-SECText&TEXT=aHR0cDovL2FwaS50ZW5rd2l6YXJkLmNvbS9maWxpbmcueG1sP2lwYWdlPTEwNjk2NzQzJkRTRVE9MCZTRVE9MCZTUURFU0M9U0VDVElPTl9FTlRJUkUmc3Vic2lkPTU3