How do "increased effect of Auras" nodes work?

For example, if I'm using Anger lvl20, which adds 69-110 fire damage to spells. If I have 20% increased effect of Auras from passive nodes, is the total added fire damage to spells calculated in the following way:
69*0.2=13,8 (rounded to 14)
110*0.2=22

69+14=83
110+22=132

Final added fire damage to spells from Anger with 20% inc effect of auras would be:
83-132

Is this correct? Also, do you think this is worth taking (2 nodes) for a fast casting spell like incinerate?
1H+Shield High Block&Spell Block Tank: http://www.pathofexile.com/forum/view-thread/868995
Ice Crash Crit Staff AKA "The Shaterring Karui": https://www.pathofexile.com/forum/view-thread/1289037
Tanky Block+AR+EV Ranger Crit Reave Dagger/Claw: https://www.pathofexile.com/forum/view-thread/1301888
13.8 rounds to 13. Other than that, yes.
(can also just mutliply by x1.2 :P )
Oh, really? I though everything above 13.5 is rounded to the next number? Anyway, thanks!
1H+Shield High Block&Spell Block Tank: http://www.pathofexile.com/forum/view-thread/868995
Ice Crash Crit Staff AKA "The Shaterring Karui": https://www.pathofexile.com/forum/view-thread/1289037
Tanky Block+AR+EV Ranger Crit Reave Dagger/Claw: https://www.pathofexile.com/forum/view-thread/1301888
There's a bunch of different rounding methods around. Final values and stats in Path of Exile are calculated using the method often called 'integer division', which simply drops all decimal values in the end, effectively rounding down the final value.

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