Required: a. Calculate 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 $3.2 billion. Calculate an estimated cost of goods solc and gross profit for the four months, using the gross profit ratio for 2020 . Complete this question by jentering your answers in the tabs below. Calculate the gross profit ratio for each of the past three years. Note: Round your answers to 1 decimal place. Required: a. Calculate the gross profit ratio for each of the past three years. b. Assume that Campbell's net sales for the first four months of 2021 totaled $3.2 billion. Calculate an estimated cost of goods sold and gross profit for the four months, using the gross profit ratio for 2020 . Complete this question by entering your answers in the tabs below. Assume that Campbeirs net sales for the first four months of 2021 totaled $3.2 billion. Calculate an estimated cost of goods sold and gress profit for the four months, using the gross profit ratio for 2020 . Note: Do not round intermediate calculations. Enter your answers in millions rounded to nearest whole number (l.e., 5,000,000 should be entered as 5)