configuring product attributes

[Guest]

I am working on a site to sell water filters, in the product atributes i wanted to add quantities at different price breaks

For example 1 @6.50 = $6.50

6 @6.20 = $37.20 But i keep getting the value added price showing up and it looks like this

 

1 @6.50

6 @6.20= (+37.20)

This is showing up on the shopping cart page under avalible options

(see here http://filtersforless.com/catalog/product_...products_id=28)

Is there any way to not show the value added price in the drop down box and still have the total be correct

 

Thank you in advance