in germany there is a special Tax on coffee: 2.19 EUR per 1000 gram, and 4.78 EUR per 1000 gram for instant coffee.
I'd like to solve this problem by adding a custom tax to magento.
How would I do that?
I need to calculate the additional product tax based on the product weight instead of the product price.
The product weight may change depending on which (or if any) product options are selected. This is a customer requirement and cannot be changed.