using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(CalculateTax(600000.0m));

    }

    private static decimal CalculateTax(decimal income)

{

    decimal incomeTax = 0;

    CalculateTaxForBracket(1000000.0m, .30m, ref incomeTax, ref income);

    CalculateTaxForBracket(500000.0m, .20m, ref incomeTax, ref income);

    CalculateTaxForBracket(250000.0m, .10m, ref incomeTax, ref income);

    CalculateTaxForBracket(0.0m, .0m, ref incomeTax, ref income);

​

    return incomeTax;

}

​

private static void CalculateTaxForBracket(decimal taxBraketFloor, decimal taxRate, ref decimal calculatedTaxes, ref decimal remainingIncome)

{

    if (remainingIncome > taxBraketFloor)

    {

        calculatedTaxes = calculatedTaxes + (remainingIncome - taxBraketFloor) * taxRate;

        remainingIncome = taxBraketFloor;

    }

}

}