public double AddItem(Merchandise newItem)
{
if (Items.Any(item => item.Equals(newItem)))
{
Quantity[newItem.Type + ":" + newItem.Name]++;
}
else
{
Items.Add(newItem);
Quantity[newItem.Type + ":" + newItem.Name] = 1;
}
Total = 0;
foreach (Merchandise i in Items)
{
int quantity = Quantity[i.Type + ":" + i.Name];
Total += i.Price * quantity;
}
List <double> discounts = BulkBuy();
Total = Total - discounts[0] - discounts[1];
return(Total);
}