Question on how weapon damage affects skills.

Ok, so generally most bonuses in talents/gears/gems are added in a lump sum (so 100% physical damage bonus 100% damage bonus with swords make you do +200% damage its not multiplied with each other AKA diablo 2 system).


But how does this apply to weapons?

Let's say you have 100% bonus damage with swords and 100% physical damage bonus (+200%)


you are using a sword of cutting really well (normally it's 10 dmage, but it has +100% physical making it to 20 damage instead).


Does your sword now do 20 damage +200% = 60 damage?

Or does your sword's +100% physical get added in the lump sum? 10 damage +300% = 40 damage.


Also how does this apply for elemental? is it the same?