[Areola]

[ QUOTE ]
The correct answer is "a". To my knowledge, this was universal in Vegas until recently.

For better or worse, Planet Hollywood has adopted a seemingly insane rule that states the raise must be double the previous bet.

So a player bets 100 on the flop and the next player raises to 250. A player wanting to raise the bet of 250 must make it a minimum of 500 (not 400).

Strange but true. (at least as of a couple months ago)

[/ QUOTE ]

From my understanding, there are two no-limit raise rules.
First one (what I thought to be more common) is "double the raise" rule and the second is "double the bet" rule.
Seems like Planet Hollywood adopted the "double the bet" rule.

I still think that a) is the correct answer but I've had b) suggested by a tournament director who does fairly large tournaments.