Tax calculation challenge

    public static decimal GetTaxAmount(decimal amount)
        {
            var taxRates = new[] {
                new { Minimum = 40230, TaxRate = 45 },
                new { Minimum = 21240, TaxRate = 33 },
                new { Minimum = 14070, TaxRate = 30 },
                new { Minimum = 8660, TaxRate = 23 },
                new { Minimum = 5070, TaxRate = 14 },
                new { Minimum = 0, TaxRate = 10 }
            };

            return taxRates.Where(tr => amount - tr.Minimum > 0).Select(tr =>
            {
                var tax = (amount - tr.Minimum) * tr.TaxRate / 100;
                amount = tr.Minimum;
                return tax;
            }).Sum();
        }