Thanks for all your answers. Some of them (2a & 2b) are now solved. For the more comolex 2c question I should really know the exact formula. However in general I know when to vote.

With my last question I meant your curation fee as percentage of your total SP. In my case I received 0.025 SP for curation last week. I have 15SP. So that results in 0.025/15*100%=0.17%.

What's yours?
(Btw I know I can calculate yours by myself, but I prefer some interaction and discussion)