thanks, so this could happen say if i got an upvote and at the time it was worth 10 STU and SBD worth $5(meaning i should get a payout of 100.750.5=3.75SBD*USD$5=USD$18.75). On the payout day SBD rose to $7 and it uses USD$18.75/7, so i would get 2.678 SBD instead of 3.75SBD? And this would also apply on Steem power calculation..
RE: Can author reward goes below 75%?