How much can you earn by selling tofu brain a year?

Selling tofu brain can earn tens of thousands a year, because if tofu brain is placed on the street, it usually sells a bowl of 6-8 yuan. If you subtract some cost price in this way, 10000 is probably a few dollars. If you sell 200 copies a day, it will cost hundreds of dollars a day, but if the business is not good, it may not be so much. However, if you want to open your own shop, you have to pay the rent every month.