Multi Tabling, BR Question?

Ok, so i know that you should only risk about 10% of your BR at one time.
But does this still apply when your multi tabling?
For example, if my BR is at $100 then i should be playing $10 max (risking 10% of my BR), But what if im playing at two different $10 max tables?
Am i then risking 20%?
Do you need a bigger BR to multitable at the same stakes

I hope you know what i mean.

Personally, I wouldn't multi-table at those stakes with anything less than about $400, but I generally err on the side of caution where my BR is concerned. Check the archives here for much useful and knowledgeable discussion on BR management.