So, you must calculate % yourself - guess nobody done this yet
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Ok, so it started with 0.1% per day and is gradually dropping down to 0.01% per day over a period of 5 years. If it's adjusting once per 3 months, that's what, 20 adjustments in total? Considering that it all started on April 26, there's been one adjustment already, so the current interest should be somewhere around 0.095%, and it'll drop down to ~ 0.09% in October.  

And what does this mean: "max accumulated coin-day is 30 days (after 30 days, only the 130-day coin-day will be counted)"? I suppose "130-day" is a typo and it should be "30-day". But I don't get this "coin-day" thing. With 10mil in the wallet, 0.095% is just 9500 JPC per day, which is kinda low compared to PoW mining. I mean, to buy 10mil JPC, one needs to spend at least 1 BTC, so one loses 1 BTC to buy some alt. currency (that's been going down in price for quite some time now) and in return gets less than 10k JPC per day via staking. But with 1 BTC one can easily buy 3x 750 Ti, and each of those 750 Ti cards makes ~10k JPC a day, so it's ~30k JPC a day for the same 1 BTC spent, which even with expensive electricity is still at least twice more profitable than going to an exchange and buying those 10mil JPC for staking. Buying GPUs is also a lot safer investment than buying coins.

I'm curious though whether my math is right, cause someone in this topic previously said that they were making more money from staking JPC than from mining. Maybe it's not 9-10k a day with 10mil in the wallet, but more? This "coin-day" thing is a mystery for now. Anyway, sorry if it all sounds dumb, I'm totally new to PoS and reading introductory articles about it didn't help, still not clear on the subject. Can anyone that does staking give an example of how much they've got in their wallet and how much they make with PoS?