the monthly turnover of catering is 13,111 yuan, and the profit is 3,911 yuan. The gross profit of catering is between 45% and 61%, with a monthly turnover of 13,111 and a profit of 7,811 yuan. After deducting rent, water, electricity, labor, taxes and fees, under normal circumstances, the net profit is between 21% and 31% and the profit is 3,911 yuan.