Magento price script (markups for different customer groups) -- 2

We need to have a price script written to allow the markup of all products to include customer groups only. Example: Customer group B: 0 to 10$ cost + 20% 11 to 50$ cost + 19% 51 to 1000$ cost + 15% Customer Group A 0 to 10$ cost + 10% 11 to 50$ cost + 9% 51 to 1000$ cost + 5% This script would need to create the group price for all products and have a separate markup as shown in the markup above for each group. A link that may of be of some help: [login to view URL] I also have a script that does markups for the cost but only updates the price and not a group price. (Will provide on request). This should be a simple task for the right candidate.