I can translate anything you want from English to Portuguese and vice versa. Could be articles, documents or books. The price will be defined by what you want: if it's a short thing, yeah it will probably be much less than $15. But if it's a huge text or something like that, I'll keep my price or increase it. I'm native at Portuguese and it was one of my favorite subjects at school, so don't worry, I can speak a good Portuguese - same for English (I can use the formal vocabulary easily).