Talk:Tenacious (Season 2013 Mastery)/@comment-76.170.241.84-20121205021302/@comment-5604521-20121207145532

Emptylord has it correct. I'll do it another way that might make it a bit more obvious:

Mercury Treads have 35% CC reduction, so any CC is 65% of it's original length. This Mastery has 15% CC reduction (at most) so any CC is 85% of it's length. With both of these applied, and Tenacity stacking multiplicatively, the resulting CC effect's length is 65% x 85% or mathematically: 0.65*0.85=0.5525 or 55.25%.

55.25% is the final length of the CC, so the reduction is 100%-55.25%=44.75%