New Formulas Simplified

I read base crit damage is 120%~150% of your range. Assassins can boost that with Critical Mastery to 130%~160%. Then SE adds 30% crit damage, which I assume is to both spectrums, with a final crit damage of 160%~190%.

First of all, is crit damage additive or multiplicative? If it's additive, that damage bonus will be MUCH lower.

Second of all, those skills raise "Criticaldamagemin." The 150% may not increase at all.