Roulette table. Gives you almost even odds to double your money. Higher stakes tables if you're walking up with $1600 in your pocket. If you get a drink out of

Roulette table. Gives you almost even odds to double your money. Higher stakes tables if you're walking up with $1600 in your pocket. If you get a drink out of it you can consider that as an extra dividend on top of your returns. I'm joking. But the question is kinda crazy because it doesn't scale. You're asking for a 100% return in a month. That's 4000% or more annualized return... Assuming you're starting with that initial capital and you want to keep it working. For those returns you need to take massive risks. Gambling is one way. Options markets is another. (See gambling)