using System;

public class Program

{

    public static void Main()

    {

        run(100, 1, 3);

        run(100, 1, 10);

        run(100, 2, 3);

        run(100, 2, 10);

        run(100, 3, 3);

        run(100, 3, 10);

        run(100, 4, 3);

        run(100, 4, 10);

        run(100, 5, 3);

        run(100, 5, 10);

    }

    private static void run(decimal amount, int discountType, int years) {

        var result = new Class1().Calculate(amount, discountType, years);

        var text = result.ToString().PadRight(7);

        var parameters = string.Format("amount: {0}, discountType: {1}, years: {2}", amount, discountType, years);

        Console.WriteLine(text + " \t>>>\t " + parameters);

    }

}

​

​

​

​

​

​

//  NotRegistered = 1,

//  SimpleCustomer = 2, (10%)

//  ValuableCustomer = 3 (30%)

//  MostValuableCustomer = 4 (50%)

​

public class Class1

{

    private int type;

​

    public decimal Calculate(decimal amount, int discountType, int years)

    {

        this.type = discountType;

        decimal result = 0;

        decimal disc = (years > 5) ? (decimal)5/100 : (decimal)years/100; 

        if (type == 1)

            {

                result = amount;

            }

            else if (type == 2)

            {

                result = (amount - (0.1m * amount)) - disc * (amount - (0.1m * amount));

            }

            else if (type == 3)

            {

                result = (0.7m * amount) - disc * (0.7m * amount);

            }

            else if (type == 4)

            {

                result = (amount - (0.5m * amount)) - disc * (amount - (0.5m * amount));

            }

​

            return result;

    }

}

​

/*

100         >>>     amount: 100, discountType: 1, years: 3

100         >>>     amount: 100, discountType: 1, years: 10

87.300      >>>     amount: 100, discountType: 2, years: 3

85.500      >>>     amount: 100, discountType: 2, years: 10

67.900      >>>     amount: 100, discountType: 3, years: 3

66.500      >>>     amount: 100, discountType: 3, years: 10

48.500      >>>     amount: 100, discountType: 4, years: 3

47.500      >>>     amount: 100, discountType: 4, years: 10

0           >>>     amount: 100, discountType: 5, years: 3

0           >>>     amount: 100, discountType: 5, years: 10

*/

​