I want to add a profit percentage in odoo 9 with a pricelist rule formula, and searching in web I only find the option to do it but with the odoo version 8, because the formula in code changed to odoo 9.

Here is the code line in odoo 8 for that rule:

https://github.com/odoo/odoo/blob/8.0/addons/product/pricelist.py#L342

and here is the current code line in odoo 9: 

https://github.com/odoo/odoo/blob/9.0/addons/product/pricelist.py#L235

Because that change I have no option to add to the price a percentage to set a margin profit in a pricelist rule, maybe in odoo 9 there is another way to accomplish what I want or not. Some of yours can give me a great answer to this.