2) Second problem, pricematrix does not work with % , only fixed prices per quantity step. In the configuration
it says you can fix the price either 0.3 or 3% but if we use % the plugin use it as a fix price.
It is very important to be able to make a pricematrix using %discounts instead of fixed prices , as if not, we will need
to build one META for every product, and if we have 5000 products, it makes imposible to manage.