Gross profit margin is the percentage of gross profit and sales income (or operating income), where gross profit is the difference between income and operating cost corresponding to income.

Expressed by the formula: gross profit = gross profit/operating income × 100%= (main business income-main business cost)/main business income × 100%.

Classification method:

By commodity category: gross profit margin of single commodity, gross profit margin of large commodity and gross profit margin of comprehensive commodity.

Sub-industry: gross profit margin of product sales of industrial enterprises, gross profit margin of commodity sales of commercial enterprises, gross profit margin of construction industry, gross profit margin of transportation industry, gross profit margin of tourism and catering service industry.

Sub-region: sales gross profit rate and project gross profit rate by project region.