CH a. Calculate the gross profit ratio for each of the past three years. (Round your answers to 2 decimal places.) 2017 2016 2015 56.99% 54.25% 48,82% b. Assume that Campbell's net sales for the first four months of 2018 totaled $12.5 billion. Calculate an estimated cost of goods sold and gross profit for the four months, using the gross profit ratio for 2017 (Round Intermediate calculntions to 2 decimal places. Enter your answers in millions rounded to nearest whole number (l.e., 5,000,000 should be entered as 5).) Cost of goods sold Gross profit million million