LC: Hypothetical dilemma.

[FeNeF]

I'm having a bit of an argument with a fellow 2+2er here, and I'd like to get some more opinions.

You're at the beginning of a regular 50/30/20 SnG, and a magical genie approaches you. He offers you a deal. X% of the time, you will double your chip stack and another player chosen at random gets eliminated, and the rest of the time you are eliminated.

How large does X have to be for you to accept the deal?