I have a pretty basic question about upvoting on Steemit.

I am hoping someone who has been on Steemit for a while can help me answer it. When I do 100% upvote when my voting power is around 80%, The vote is worth about 8 cents. What I am curious about, is how is that calculated. Must be 80% times something times 100%. But what is that something! Hope someone can help me, would be great. Have a WONDERFUL day everybody!