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that those can vary sometimes confuses me still. not even sure how would i go about to explain it :D

There's many factors, that's why people get confused.

My easy way to explain, is to simply say, HIVE value varies, right? so look at it as you are getting X $HIVE from all the upvotes, but when the 7 days finish, 50% of that hive (in HBD value) is going to be sold for HBD and paid out.

Does this way make you understand why the value varies if constantly showed in HBD+HIVE ?

More Info Example so it makes more sense:

Imagine a post has 10 HBD in upvoted rewards, and its set to pay in 50/50% (HBD/HIVE). An lets say 2 HIVE = 1 HBD to simplify...

Then the calculation is, 10 / 2 (because author only receives half) = 5 HBD´
Then because the post is set to pay 50/50% in HBD/HIVE, and because the 2 HIVE is 1 HBD, the author receives, 2.5 HBD + 2.5 x 2 = 5 HIVE

In conclusion, you get 2.5 HBD + 5 HIVE from author rewards.