$2-$a$.$ What was the amount of gross profit?

Gross profit

$2-$b$.$ What was the gross profit percentage?

Gross profit percentage

$2-$c$.$ Which of the following$($s$)$ is true? $($Select all that apply.$)$

The gross profit percentage is the average amount of gross profit earned on each dollar of net purchase.

The gross profit is cost of goods sold minus net sales revenue.

The gross profit is net sales revenue minus cost of goods sold.

The gross profit percentage is the average amount of gross profit earned on each dollar of net sales.