Refer to the following mentioned data. (In millions)201120102009 Net revenues $34,805 $30,215 $26,039 Cost of products sold14,36713,65313,019 Gross margin$20,438$16,562$13,020 Required:a.Calculate the gross profit ratio for each of the past three years. (Round your answers to 2 decimal places.) 2011: ______%2010: ________%2009: _______% b.Assume that Campbell’s net sales for the first four months of 2012 totaled $12.27 billion. Calculate an estimated cost of goods sold and gross profit for the four months, using the gross profit ratio for 2011.(Enter your answer in millions (i.e., 5,000,000 should be entered as 5). Round your intermediate calculations to two decimal places and your final answers to the nearest dollar amount.)Cost of goods sold: $_________ millionGross profit: $_______ million