Formula after input on different products

Hi Didier Van Uffelen
Excuse me, This is the same problem as you explained in the other post of
altoswebsolutions.com/forum/woo-price-ca...fferent-product#2429
If yes, can both be unified?
David
at1454

Could it be possible to add a little formula after an input field when a specific product is selected? In example: same input field for product A and B.
Product A: input 100 => should output "100" to the excel
Product B: input 100 => should output "(100/21)" to the excel

Thanks!