[Not a bug] Blade vortex mana cost

Why my BV skill lvl 18 (19 mana cost) cost me 40 mana with echo (140%) + phys to light (110%) + critical strike (115%) + fire damage (120%) instead of 35 mana cost (19*1.85) ??

I make a mistake ?

Thank you
Last bumped on Nov 14, 2016, 7:13:32 PM
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Mana multipliers are multiplicative, rather than additive.

19 * 1.40 = 26.6
26.6 * 1.10 = 29.26
29.26 * 1.15 = 33.65
33.65 * 1.20 = 40.38
Thank you

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