on the top right you have the STU price which is the average price of steem every hour over the past 3.5 days...

as this number rises so does the number of rewards... so if the STU price was $4.70 I would more or less see an author reward today of 12.65 steem and 27.67 of sp author reward so thats 40.32 x $4.70 so $189.51 a day...

we would have to be in an epic bull market to sustain those prices long term though because people with a lot more sp than me will be selling out a lot bigger rewards