HOW MUCH DAMGE CAN LEBLANC DO!!!!

Today i played , and OMG she does a hellsalot of damage, when i was lvl18 and launched my q,r,w the dudes hp bar was out the damn window i literately deleted him, i really don't know how much damage i did to him but i was wondering, standard full ap build including baron nashor buff(btw this is my standard full ap build sooo), lvl18, how much damage can that combo do to another lvl18 full health champion cause i am just blown away, of course i can just add up all the damage from q,r,w but thats boring so just tell me <3