Talk:Armor penetration/@comment-81.227.9.138-20121229231636

Am I right that armor penetration is calculated using the armor value the target has after any armor reduction is applied?

Would that mean that % armor reduction and % armor penetration can treated as the same thing when calculating the armor your target has left?

Example: 15% arm red from xins passive, 35% arm pen from LW and 25% arm red from (max stacked) BC =

0,85*0,65*0,75 =~ 0,41

0,41 = 59% armor gone

If u would top up with 54 flat armor penetration (19 from runes, 20 from youumu, 10 from BC and 5 from masteries) u would do true dmg to targets with

x*0,41 = 54

x = 54/0,41 =~ 132

132 armor!

(It sounds ridiculus. I must have misscalculated somewhere or missunderstood the mechanics, please tell me where. (Preferably someone that actually understand the mechanics like user:ProtonZero))