Zend certified PHP/Magento developer

I need to show for the customer group only the final price

The client wants to add different clients groups to set different prices of a product (depending on the client group). So as you know when you set up the prices on the admin, and go to the front you find, the old price crossed , and the final price. (the one i added in the customer group) So the client wants only to show the final price, but he wants to show the offers when you apply a rule in the catalog. Can anyone guide on me on this?

Here are some examples:

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