One dollar.

According to the Youth Entrepreneurship Network, the costs include ingredients, cups, water, fuel and other costs. The profit of porridge is very high. The average profit is about 70%, such as preserved eggs and lean meat. Rice porridge is 1 cent, meat is 3 cents, seasonings such as oil, salt, onion, ginger, and garlic are 2 cents, water and fuel are 3 cents, and the cost is only 1 yuan.