How do percentage damage modifications work?

[NuclearStudent]

Question is title.

For example, Muton armor has a value of 28, and there is a 60% modifier to AP ballistic type damage. If an AP shot rolls 50 when it hits the armor, how much damage does the Muton actually take?

Would the calculation be (50damage-28armor) multiplied by 60%=13.2 damage?

Or would the calculation be (50damage multiplied by 60%)-28armor=2 damage?

I would guess the first calculation, but I don't really know.

[yrizoud]

It's the second : Damage multiplier first, THEN armor reduction.
This makes resistance very, very efficient.