public double Apply(Checkout.ItemCodeCounts item, Offers offer)
{
var offerCount = item.Count / offer.ItemCount;
var itemsLeft = item.Count % offer.ItemCount;
item.Count = itemsLeft;
return(offer.DiscountPrice * offerCount);
}
public double Apply(Checkout.ItemCodeCounts item, IOffers offer)
{
return(Apply(item, (Offers)offer));
}