All sites have standard rake % for their cash games, usually with a cap on max rake. This % does vary somewhat from site to site, but should usually be pretty close between them. I don't know the exact % since I only play at PS right now, but their are plenty of places to find what the exact % is. Begin with the site's homepage itself, their TOS, etc.
As for rake from tournament games, that does vary too, but $1.10 to $1.20 tournaments are probably the normal range, more toward the lower end of that I would think. I don't know what to make of a tournament with a rake of 50c on the dollar. I've never seen anything anywhere near that expensive, rake-wise. I can't imagine even bothering to play in a tournament such as that.
Also the amount of rake in tournaments, in relation to the buy-in amount, usually decreases as the tournamnets get more expensive. What I mean is you'll find $1.20 and $3.40 tournaments where as the cost of the tournamnet goes up the % taken for rake declines. You have to shop around a little bit to find the best tournamnet that fits in your budget and has the lowest rake %.