15,000 yuan. There are 100 customers in a Beijing breakfast shop every day, and each person spends an average of 10 yuan. The gross profit of the breakfast shop is 1,000 yuan. If the cost is deducted at half, the breakfast shop's daily net profit is 500 yuan, which is 15,000 yuan a month. Beijing, abbreviated as "Jing", formerly known as Yanjing and Peking in ancient times, is the capital, municipality and national central city of the Republic of China.