the tax thingy

tax.cs

public static decimal GetTaxes(decimal salary)
{
    var taxBands = new[]
        {
            new Tuple<Decimal, Decimal, Decimal>(0, 5070, 0.1m),
            new Tuple<Decimal, Decimal, Decimal>(5070, 8660, 0.14m),
            new Tuple<Decimal, Decimal, Decimal>(8660, 14070, 0.23m),
            new Tuple<Decimal, Decimal, Decimal>(14070, 21240, 0.3m),
            new Tuple<Decimal, Decimal, Decimal>(21240, 40230, 0.33m),
            new Tuple<Decimal, Decimal, Decimal>(40230, Decimal.MaxValue, 0.45m)
        };

    return taxBands.Aggregate(0.0m, (taxOwed, taxband) =>
        {
            if (salary < taxband.Item1)
                return taxOwed;

            if (salary < taxband.Item2)
                return taxOwed + ((salary - taxband.Item1) * taxband.Item3);

            return taxOwed + ((taxband.Item2 - taxband.Item1) * taxband.Item3);
        });
}