Net sales Cost of products sold Gross margin 2020 $ 34,34514,914 $ 19,431 (In millions) 2019 $ 30,462 13,731 $ 16,731Required: a. Calculate the gross profit ratio for each of the pastthree years. b Required: a. Caiculate the gross profit ratio for each of the past three years b. Assume that Campbeil's net sales for the first four months of 2021 totaled \( \$ 12.54 \) billion. Calculate an estima 1 answer