Please explain how to figure out the question marks on this problem and explain. Thanks!

Question 4 Two or more items are omitted in each of the following tabulations of income statement data. Fill in the amounts that are missing. 2013 2014 2015 S290,000?S $410,000 11,000 13,000? ales revenue Sales returns and allowances Net sales Beginning inventory Ending inventory Purchases Purchase returns and allowances 5,000 8,000 0,000 Freight-in Cost of goods sold Gross profit on sales 347,000 ? 20,000 32,000? ?260,000 298,000 8,000 9,000 12,000 293,000 46,000 91,000 97,000 233,000