on the checkout page when the promo code is applied, I need to update the item details on the basis of some calculation of promo code for final sale

I have to show final sale text dynamically when the discount is more than 50% on each item. When a promo code is applied on checkout the page doesn't reload, it updated things dynamically.

How can I calculate the final sale logic and update it after the promo code is applied. like that

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