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when you send 4 SBD and get 10$ upvote and your payout time rise you will get your investment 4 SBD back plus you will get free Steem also its a magic SBD default rate on steem always 1$ and always choose the option 50%/50% so that your post reward split into half of SBD and half oF Steem power

ok good to know, can you explain the 50/50 option more? When should i use the 50/50?