Price per Kg

Hello,

I've installed the latest version of opencart, and i need the prices to be 5 E/Kg , so I've changed the currency to simbol/Kg , now the problem is in the cart when it displays the total and it's 300 E/Kg.

How can I solve this problem ? I was thinking maybe editing the cart file and put somewhere just the sign for the currency but I can;t find it.

Please give me a hand if anyone knows how I can solve it.

Thank you for your time.