Talk:Armor penetration/@comment-41.212.12.214-20120521050232/@comment-109.108.1.120-20120521195609

Get your facts right. It stacks multiplicatively, so it's (1-0.4) x (1-0.25) x (1-0.1) = 0.405

So he can have 1-0.405=0.595~60% armor penetration.