I'd like to ask, what is the max armor penetration I can get? By that I mean, not what is the max I can get from items, runes and masteries but what is the max available. I heard that the max is 40% and no matter how much more armor penetration you have it won't matter. I'm not totally sure about that though.
I have 19 armor penetration from runes and 6 from masteries, so in total I have 25 from the start of the game. If I take Last Whisper (which gives me 35% more), Black Cleaver (10% more) and Youmuu's Ghostblade (20%) I will have 90% armor penetration. Will all of it count or only 40% of it while the rest won't even matter?