billion, gross profit of $$17\mathrm{.}14$ billion, and net income of $$2\mathrm{.}68$ billion.

a$.$ Compare the gross margins for Walmart and Costco.

b$.$ Compare the net profit margins for Walmart and Costco.

c$.$ Which firm was more profitable in $2017?$

a$.$ Compare the gross margins for Walmart and Costco.

The gross margin for Walmart is $\%.($Round to two decimal places.$)$

The gross margin for Costco is $\%.($Round to two decimal places.$)$

b$.$ Compare the net profit margins for Walmart and Costco.

The net profit margin for Walmart is $\%.($Round to two decimal places.$)$

The net profit margin for Costco is $\%.($Round to two decimal places.$)$

c$.$ Which firm was more profitable in $2017?($Select from the drop$-$down menu.$)$

was more profitable in $2017.$