Some basic Steemit questions

Hi!

Just a few questions I am hoping the long-time community members can answer please:

1. Where can one see what the current SP "interest rate" is?
2. Where can one see what the current SMD interest rate is?
3. Does one get SMD interest paid only on a MONTHLY basis?
4. Can one purchase SMD from Poloniex.com and add them to your STEEMIT SMD balance? Or can one purchase STEEM from poloniex.com and convert that to SMD and add it to your SMD balance on STEEMIT?

Thanks a lot for any answers :D