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Well the amount is not 100% accurate. The ammount may vary on many factors, and you'll know for sure only when you receive the reward.

SteemIt values SBD at $1 and Steem at a 3 day average of the feed prices. Therefore, if SBD price is $5-10+ then the actual payout in USD will be far higher than what SteemIt shows.

A post pays out 75% rewards to author, 25% to curators. Of that 75%, posts often pay out 50% SBD and 50% SP.

With some number, lets say a post has a value of $100 on SteemIt.

The author will receive $75 and the curators $25.

Of that $75, half will be SBD and half will be STEEM. Currently SBD is $9.85 and STEEM price is $6.30 (but since the price very recently bumped, the average on Steem is closer to $3-4)

$75 / 2
$37.50 in SBD ~$369.38
$37.50 in STEEM ~10.7 STEEM ~$67.41

Post total value with current market rates, $436.79

This, for a "$100" post on SteemIt. Numbers may vary when calculations are done at different times.

I didn't know about the 3 day average rule. thank you :-)