I've been doing testing on how bow damage is calculated (my math is terrible, as are my explanation skills so please bear with me).
The damage done to an enemy when shooting a bow (We'll call this base damage) is calculated by Power + Arrow Damage.
The Bow has 8 Power and the Wooden Arrow does 6 Damage, making the Base Damage 14.
You have bonuses from Dexterity (5%), Marksman (10%) and Sharpshooter (20%) if you pick up these skills their percentages are additive NOT multiplicative.
So, 14 Base Damage + 1 Dex = 15 (All of the testing I've seen it rounds up your damage), with the Dex and aforementioned damage increases your damage will be 19 (14 + 35%).
Now, I've added the Skillshot which increases damage to the head by 20%, what I'm confused on is the total damage is now 48, however I cannot figure out for the life of me WHERE this 20% is applied.
-# All of the testing was done on Wolves and Goats in the Springlands none were resistant or weak to piercing damage.