Goods.cs

sealed class Product
{
    public int Quality;
    public int Cost;
}

class Goods
{
    static void Main(string[] args)
    {
        Product objProduct = new Product();
        objProduct.Quality = 50;
        objProduct.Cost = 75;

        Console.WriteLine("Quality of the Product: " + objProduct.Quality);
        Console.WriteLine("Cost of the product: " + objProduct.Cost);
    }
}

class Pen : Product
{   
}