If/else if loop always goes to else statement

I'm trying to make a function that determines commission based on user entered amount. It takes a user entered double and uses it to determine which equation it is used in. But the code I wrote always goes to the else statement, and I am not sure what is wrong with my conditions.

double calculate(double s)
{
    double c;
    if (s > 300,000)
    {
        c = 25,000 + (0.15 * (s-300,000));
        cout << "went to if" << endl;
        return c;

    }

    else if (300,000 > s && s > 100,000)
    {
        c = 5,000 + (0.10 * (s-100,000));
        cout << "went to else if" << endl;
        return c;

    }

    else
    {
        c = 0.05 * s;
        cout << "went to else" << endl;
        return c;

    }
}