Talk:Armor Penetration/@comment-201.200.80.22-20100715162307

ARP is applied like this Flat then % then Reduction

Basically Stark's then Last Whisper then Black Cleaver Opponent has 100 Armor and you have no other ARP than those 3 Items 100 -20 then -32 then -12 per hit up to 5 stacks I believe. so basically before getting hit with cleaver they are already at 48. If you manage to hit them 4 times they will be at 0. And next hit will be full damage. And will leave them at -12 Armor and will deal 12 more damage than your AD at the moment.

So it is possible to do this its just not practical since Black Cleaver not so good item.