?using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace BookManager
{
    public class POS
    {
        public bool Scan(Book book,IDiscount id)
        {
            if (book.Storage > 0)
            {
                double last=id.GetNewPrice(book.UnitPrice);
                book.SellPrice = last;
                book.Storage--;
                return true;
            }
            else
            {
                return false;
            }
        }
        
    }
}