private static decimal CalculateDiscountAtLevel(int level)
{
var discount = Bookshop.GetDiscountForLevel(level);
var cost = level * Bookshop.Price * (1 - discount);
return(cost);
}
private static decimal ApplyHighestDiscount(ref Basket basket)
{
var level = basket.Distinct;
var discount = Bookshop.GetDiscountForLevel(level);
basket.RemoveDistinctLevel();
var cost = level * Bookshop.Price * (1 - discount);
return(cost);
}