How are all the damage bonuses applied?

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I was trying to calculate the relative differences of a few pieces of gear - namely ones that add +damage% to one damage type, and I couldn't figure out how all these damage types are applied.
For the sake of argument, take a barbarian with the following:
- 9,000% increased damage from strength.
- 40% increase to physical damage
- 25% increase to primary skill damage (Simplicity's Strength gem)
- +15% damage to some primary attack (Bash, let's say)
and afterwards, what happens if he has 400% critical strike damage and he gets a critical strike? Are all of these sources multiplicative?
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How is damage bonus calculated?
Your bonus to damage is just your strength bonus, so it's +3. You would add +3 to whatever damage die is specified by the weapon you're using. So if you were using a dagger, it would show "1d4 + 3" and that's what you would use. (This is not your hit dice, hit dice are something else).How do damage multipliers work in diablo 3?
You have to multiply all together to figure out what your damage is going to be. Sheet DPS = Base Stat Factor * Base Damage Factor * Crit Factor * Damage Inc. by Skills Factor * Speed Factor. Actual DPS = Sheet DPS * Skill Weapon Damage Factor (*Damage to Elites Factor).How does diablo 3 calculate damage?
The formula for base outgoing damage of an ability is: is the sum of all percentage attack bonuses the subject has. This includes effects such as Pyro Resonance.How Hill Bonus Affects Units Dealing One Damage in Age of Empires 2!
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