Changes in a custom module for importing products

Hi we do use for our Magento store a custom module for import of our products. Now we do have 2 problems there: 1 Problem: After upload this module set the price on our store, now 15% for all products, but we need a change there so it would be: 15% Margin for products up to 100 € 10% Margin for products 100 € and more 2 Problem: One from our supplier did change the XML file structure, and our module can not read it, so our .php for this XML file need to be updated I can not give you access to our server, I send you the .php file and link to XML file from supplier so you can check it how is structured and change .php file regarding this structure.