using System;

using System.Collections.Generic;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var payments = new List<Payment>

        {

            new Payment { TotalAmount = 3000m, UkWorkdayCount = 15, ForeignWorkdayCount = 5 }, //Total UK taxable amount is: 2250.00 GBP

            new Payment { TotalAmount = 1281.50m, UkWorkdayCount = 3, ForeignWorkdayCount = 18 }, //Total UK taxable amount is: 183.07 GBP

            new Payment { TotalAmount = 250m, UkWorkdayCount = 31, ForeignWorkdayCount = 0 }, //Total UK taxable amount is: 250.00 GBP

            new Payment { TotalAmount = 50.63m, UkWorkdayCount = 0, ForeignWorkdayCount = 4 }, //Total UK taxable amount is: 0.00 GBP

​

        };

​

        //Validation for each payment

        //foreach(var p in payments)

        //{

          //  Validate(p);

        //}

        var totalTaxableAmount = CalculateUkTaxableAmount(payments);

        //Write each individual item in the list to the console

        int i=0;

        payments.ForEach(payment =>

        Console.WriteLine(string.Format("Total UK taxable amount is: {0} GBP",

            totalTaxableAmount[i].ToString("F", CultureInfo.InvariantCulture),i++)));

    }

public static List<decimal> CalculateUkTaxableAmount(List<Payment> payments)

    {

        List<decimal> totalTaxableAmount = new List<decimal>();

        foreach (Payment payment in payments)

        {

                var totalAmount = payment.TotalAmount;

                var ukWorkdayCount = payment.UkWorkdayCount;

                var foreignWorkdayCount = payment.ForeignWorkdayCount;

​

                //Convert workday count to decimal type for calculations

                decimal ukWorkdayDecimal = ukWorkdayCount;

                decimal foreignWorkdayDecimal = foreignWorkdayCount;

​

                totalTaxableAmount.Add(totalAmount * (ukWorkdayDecimal / (ukWorkdayDecimal + foreignWorkdayDecimal))); 

        }

​

        return totalTaxableAmount;

    }

}

​

 public class Payment

 {

     // total amount in GBP earned by the employee during an unspecified period (can be monthly salary, quarterly bonus, weekly laundry benefit etc.)

     public decimal TotalAmount { get; set; }

​

     // number of days employee was working from the UK during the period the payment is for

     public int UkWorkdayCount { get; set; }

​

     // number of days employee was working from a country other than the UK during period the payment is for

     public int ForeignWorkdayCount { get; set; }

 }