its due today,please help me!

Washington Company had the following sales and purchases during 2009 , its first year of business. Required a. Calculate the ending inventory, the cost of goods sold, and the gross profit for the December 31,2009 , financial statements under each of the following assumptions: 1. FIFO periodic 3. Weighted average cost periodic b. How will the differences between the methods affect the income statement and balance sheet for the year