Boss Damage vs Total Damage

[emailbox]

Quick question, do they stack multiplicatively or additively? Reading some of the math-y threads in the class-based sections and I'm getting confused.

I know that Total Damage from potential and other Total Damage sources (from skills, let's say) stack additively, as does Boss Damage pots with other Boss Damage sources.

What I'm asking is between Total Damage and Boss Damage; for instance, if I have 100% Boss Damage, and 25% Total Damage, do I get a total of 150% "effective" damage on bosses, or just a straight up 125%?

[Grey]

They add together

[emailbox]

Well, pomegranate. Thanks, time to peach and cry about it to everyone on my guild list.