What is the current interest per year for novacoin? I have looked at all nvc websites and cannot find this information anywhere.
You can get it from novacoind with the getmininginfo call. It currently returns 710000 satoshis per year for one NVC, which is 71%. Alternatively you can use this formula: 1 / (0.08658/0.031) ^ 1/3 = 0.71 which also means 71%. In this formula 0.08658 is the current PoS difficulty.