Does Boost stack?

[IllidariCouncil]

Ive been playing LOL as a part timer for a while now and Im really starting to get into & thinking of making it my main game to play.

So, Im level 16 right now, wanting to hit 30 and start playing with the big boys. I bought a 50 win xp boost & was wondering if I was to buy lets say 3 more 50 win XP boost would it stack and how much xp would I get? Im trying to get to 30 asap.

If there are quicker ways of leveling please share. ty

[Duilliath]

It'd just extend it to 100-150-200.