I know the answer is NO, but i'm not 100% sure.
Well, with 41% reduction from tree and using a lvl20 reduced mana, it would be:
59% * 71%= 41,89%
41,89% * 60%= 25,13%
-So its not possible to use four 60% auras with lvl20 reduced mana.
With a lvl 21 reduced mana it would be:
59% * 70%= 41,3%
41,3% * 60%= 24,78
-It's theorically possible to use four 60% auras with lvl21 reduced mana.
And here it's my doubt, doing maths you get you can run four 60% auras with a lvl 21 reduced mana gem, but i've readen that % in auras rounds up, so it would be counted as 25% aswell. As i can't test it without a lvl 21 reduced mana, can someone tell me if i could run four 60% auras in that situation?