In diablo 3, for the demon hunter to be specific, one has passives such as "cull of the weak" which does 15% more damage to slowed enemies and "archery" (with two handed bow) does 15% and "steady aim" which is 20% if no enemies in 10 yards of you.
If I have all of these do I do 50% extra damage or just 20% or even just 15%.
Thanks