20 w/ no penetration = 20 vs. 60, 16.82 vs 70 and 14.14 vs 80.
The +damage is armour-ignoring and simply a damage shift on the equation = 40 / 36.82 / 34.14
With 20% armour penetration the attack deals = 24.62 / 21.44 / 18.66 damage, plus the 20 from the attack skill (+dmg is not affected by penetration).
So... In case you were wondering, Strength and Sundering are kinda lame.
The calculations can be found out with hte calculator here on Guru, there's a link on the left side on the main page.
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