3 yuan. Bread is one of the popular foods. Bread gross profit is 30%. If it is 10 yuan, the profit can reach 3 yuan. Profit refers to the results of production and operation activities of companies and enterprises in a certain period of time, that is, the difference between income and expenses, which is the ultimate factor to reflect the operating results. Profit is a comprehensive reflection of the production and operation results of companies and enterprises, and an important part of accounting of companies and enterprises.