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The exact amount will vary based on the current price of steem and the reward pool etc... The best way to get a rough estimate would be to look at what your vote would be worth at $5k sp, and then multiply that amount by 20x. The service is designed to take your sp delegation amount, multiple it by 20, and give your percentage upvote accordingly.

Thank you very much for the explanation in very simple words. Let's start with 5000 Sp which I have delegated.