How much money does a film with 20 characters have to make a profit?

(The title is a joke!)
Basically, how much does a film have to make back to gain a profit? I
know there's a budget, the paying of people who were hired for the
film (cameramen, cast/extras etc.), marketing, and maybe anything
else?
Include some links in your answer where you learned this info and you
may get 10 pts!!