where is the product price calculated ?

[HellGamer]

Hi,

 

Does anybody know where the price is calculated in the code of Prestashop ?

 

I need to reverse the specific price rules reduction percentage so it is an increase

I've found what I thought was it in price.js

curPrice = price.value * (1 - (rpercent.value / 100));

However changing the - to + does not work

 

If anyone can figure it out there is cash on offer

 

I need this so I can sell to non eu countries without bumping up the shipping charges too much