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CDR is multiplicative. It's 1- (1-CDR1)*(1-CDR2)*(1-CDR3)... and so on. Note that CDR1 means 0.1 (for 10%) or 0.08 (for 8%). For example, for you it's 1- (1-0.1)*(1-0.08) = 1- (0.9)(0.92) = 1- 0.828 = 0.172, which translates to 17.2%.
More about that here: http://www.diablofans.com/forums/diablo-iii-general-forums/diablo-iii-general-discussion/82430-ros-faq-reaper-of-souls-frequently-asked
tho my sheet CDR went from 10% to 17.2% with the shoulder on...
my question is, is this working as intended or arnt those % suppose to add upto 18%?
CDR is multiplicative. It's 1- (1-CDR1)*(1-CDR2)*(1-CDR3)... and so on. Note that CDR1 means 0.1 (for 10%) or 0.08 (for 8%). For example, for you it's 1- (1-0.1)*(1-0.08) = 1- (0.9)(0.92) = 1- 0.828 = 0.172, which translates to 17.2%.
More about that here: http://www.diablofans.com/forums/diablo-iii-general-forums/diablo-iii-general-discussion/82430-ros-faq-reaper-of-souls-frequently-asked