PercenteageAversion.js

// If you have a 50% chance of winning combined with a 40% chance of winning
// It is the same as having a 90% chance of winning combined with a 0 percent chance of winning
percentOfWin = 0.5;
percentOfWinTwo = 0.4;

totalWins = 0;

n = 100000;
while (n > 0) {
    // First Draw
    if (Math.random() <= percentOfWin)
         totalMoney++

    // Second Draw
    if (Math.random() <= percentOfWinTwo)
         totalMoney++

    n--
}

// Should give ~90% win rate, or (n * .9)
print(totalWins)