The merchant wish to show the combined percentage discount of the volume discout as well as the subscription.

Let's say, if the volume discount has 10% discount and subscription plan has 15% discount.

Then, when the customer selects the subscription option along with the volume discount pack, the volume discount widget should show the total discount as 25%.

As of now, it calculates the difference between the discounted and original price and show the discount percentage as per that which is correct but merchant wish to show the combined percentage dynamically.