for one person ?
Here it's could be family to live with $500 for month , if they don't spend (wasting) it's could reach 2 month .
As I said, many people have to make do that way. We actually have a major social program, the "Bolsa Família" ("Family Bonus") that is paid for families whose average (per person) monthy earnings do not exceed about 35 dollars. They may receive up to R$ 336 (about 89 dollars) in a family of five people.
Minimum wage for a month of legal work with a 40-hour work week is R$ 880 (about 220 dollars). But it is very demeaning to attempt to survive with that little money.