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Example - voting power 100%...your upvote will generate rewards x dollar. with voting power 50%, your upvote will generate rewards X/2 dollar and with voting power 25%, upvote will generate x/4 dollar. so keep your voting power near to 100%. so your upvote will generate more reward.
I am attaching upvote calculator for different voting power.
https://www.steemnow.com/upvotecalc.html

Screen Shot 2018-06-28 at 1.57.02 PM.png![Screen Shot 2018-06-28 at 1.57.27 PM.png]

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