Quantity discounts with options


I’m trying to offer a product that is available in multiple colors with a quantity discount. When the product is purchased in more than a color, the quantity discount is not calculating the discount correctly.

For example, a $10 item is discounted to $8 when you purchase 10 or more, it works fine when you are adding 10 of this item in the same color to your cart. But if you add 5 blue and 5 red of this item, the quantity discount is not calculated on the total of the items (all colors included) added to the cart. Instead the quantity discount is calculated on the color option… so in this example, the customer will have to add 20 items to his cart rather than 10 to get the discount on both options.

Let me know if it can be easily solved. Thanks