How much does a restaurant owner earn per month

Depending on the geographical location of this restaurant, the same restaurant is definitely different from the one that is opened in the shopping mall and the one that is opened at the entrance of the school! Shopping malls are places where people gather and income is relatively stable, the school gate is not necessarily, and there is a grade of opening, I think opening a more medium restaurant will be more popular, because the grade is too high, people can't accept the price inside, and feel that the boss makes too much money, however, the kind of medium, the average person will like a little bit! Thank you!