Product price based on the selected options/line items - Price update before add to cart
I'm using Drupal 7.14 with the actual Commerce and Commerce Product Option module.
I like to create a shop, where you can buy paper.
The products are for example:
Paper A4 with the options/line items:
Brilliant-listbox: yes/no (yes=+0,50€ per page)
Quantity-listbox (in pages): 10 (10 Euro), 50 (40 Euro), 100(70 Euro) or 200 (90 Euro)
So i created a product called "Paper A4" with the line items brilliant and quantity. That works so far.
I tried to add pricing rules. This works, but I see the result, only after clicking the add to cart button, in the cart.
I like to update the price "live", so the user can see the price before he add the product to his car.
Please can anybody give me a tip to resolve this problem?
Thank you very much in advance!