private static decimal GetTotalPrice(ProductInBasket productInBasket) { return(productInBasket.Price * productInBasket.Quantity); }
internal static decimal GetTotalDiscount(ProductInBasket productInBasket) { List <decimal> discountedItems = productInBasket.Discounts.Select(discount => discount.GetDiscount(productInBasket)).ToList(); return(discountedItems.Sum()); }