Refer to the following mentioned data.

$($In millions$)$

$202020192018$

Net sales $ $8,691$ $ $8,107$ $ $6,615$

Cost of products sold $5,6925,4144,241$

Gross margin $ $2,999$ $ $2,693$ $ $2,374$

Required:

Calculate the gross profit ratio for each of the past three years.

Assume that Campbell$$s net sales for the first four months of $2021$ totaled $$3\mathrm{.}2$ billion. Calculate an estimated cost of goods sold and gross profit for the four months, using the gross profit ratio for $2020.$