1, the gross profit margin of commodities refers to the ratio of the difference between the purchase price and the selling price of purchased commodities.

Gross profit margin (calculation formula) = (excluding tax price-excluding tax purchase price)/excluding tax price * 100%.

2. A large number means a high gross profit, which means that the greater the gross profit, the greater the gross profit earned, and the gross profit is the difference between the purchase price and the selling price.