private static void Billing(IPercentageDiscount percentageDiscount)
{
var billingService = new BillingService(percentageDiscount, new BillDiscount());
billingService.AddItem(new OtherItem {
Name = "Laptop", Price = 50000
});
billingService.AddItem(new OtherItem {
Name = "Mobile", Price = 20000
});
billingService.AddItem(new GroceryItem {
Name = "Rice", Price = 1000
});
Console.WriteLine(billingService.PrintBill());
}