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and you need one whole steem dollar...

yes but i seldom get less from it
usually roi or gain

not to mention your gain will be taken into consideration of
(Gains x 75%)/2 - investment = SBD ROI. :)
If you are calculating overall including steem power will be
(Gains x 75%) - investment = ROI

So it depends on the chance to see how much we can see in return.

yah 50% will be steem power