tax calc

using System;
using System.Collections.Generic;
using System.Linq;

namespace TaxCalc
{
    public class TaxCalculator
    {
        private readonly IList<ITaxComponent> _components;

        public TaxCalculator(IList<ITaxComponent> components)
        {
            _components = components;
        }

        public decimal Calculate(decimal salary)
        {
            return _components.Sum(x => x.GetTax(salary));
        }
    }

    public interface ITaxComponent
    {
        decimal GetTax(decimal salary);
    }

    public class TaxRangeComponent : ITaxComponent
    {
        private readonly decimal _fromSalary;
        private readonly decimal _toSalary;
        private readonly decimal _taxRate;

        public TaxRangeComponent(decimal fromSalary, decimal toSalary, decimal taxRate)
        {
            _fromSalary = fromSalary;
            _toSalary = toSalary;
            _taxRate = taxRate;
        }

        public decimal GetTax(decimal salary)
        {
            var forTax = Math.Max(0, (salary - _fromSalary));
            forTax = Math.Min(forTax, _toSalary - _fromSalary);
            return forTax * (_taxRate / 100);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var components = new List<ITaxComponent>
                                 {
                                     new TaxRangeComponent(0, 5070, 10),
                                     new TaxRangeComponent(5070, 8660, 14),
                                     new TaxRangeComponent(8660, 14070, 23),
                                     new TaxRangeComponent(14070, 21240, 30),
                                     new TaxRangeComponent(21240, 40230, 33),
                                     new TaxRangeComponent(40230, decimal.MaxValue, 45),
                                 };

            var calculator = new TaxCalculator(components);
            Console.WriteLine(calculator.Calculate(5000));
            Console.WriteLine(calculator.Calculate(5800));
            Console.WriteLine(calculator.Calculate(9000));
            Console.WriteLine(calculator.Calculate(15000));
            Console.WriteLine(calculator.Calculate(50000));

            Console.ReadLine();
        }
    }
}