Which SW supports units and price calculation

[ele]

Hey!
I tried to find a shop system that is able to calculate the prices of a my products (1kg cashew nuts, 500g cashew nuts, 100g cashew nuts) based on the kilo price. I have to change the prices every week so it would be very convenient for me that the software is calculating and changing the prices based on the kilo price.
The only system I could find was the PrestShop 1.4, but it is not released in a stable version yet . Is there any other ShopSystem that is able to do that or is there any other way to achieve that?

[FionaJMD]

I may be talking out of my bottom here but I know Zen cart can do exchange rate calculations so maybe that part of it could be adaped to calculate your weight prices.

Just guessing LOL.

[Andy c]

AS I use zencart and it does have many add ons ..try and see if 1 will fill your requirements
here
http://www.zen-cart.com/index.php?main_page=index&cPath=40&zenid=bc86278dc91951bacc36a0c83f6c7e97