Price with VAT in Prestashop group without VAT

[Blawdi]

Hello, I would like to display the PRICE including VAT 20% from the price excluding VAT.

I found this:

{l s='%price% with FR VAT' d='Shop.Theme.Catalog' sprintf=['%price%' => ($product.price_tax_exc*1.20)|string_format:"%.2f"]}
however the result is very strange 

24 800,00 € = 28.80 with FR VAT should be 29 760€

Can you help me to get the right amount?

Edited July 31, 2022 by Blawdi (see edit history)