using System;

public class Program

{

    public static void Main()

    {

        // Build an item

        var item = new ItemForSale(100);

        // Output its total price

        Console.WriteLine(item.TotalPrice);

    }

    public class ItemForSale

    {

        public decimal BasePrice { get; set; }

        public decimal Taxes { get; set; }

        public decimal TotalPrice => BasePrice + Taxes;

        public ItemForSale(decimal basePrice)

        {

            BasePrice = basePrice;

            Taxes = basePrice * 0.10m;

        }

    }

}