Shipment per weight

Hello Dear Sir or Madame,

I have a little Problem which i can’t figure out… I have an online shop where im selling light equipments.. We ship with UPS. and UPS gave us a list which says what the shipment costs per weight… so lets say if the product has a weight from 1kg to 10kg, the shipping will cost 3Euro. If the product has a weight from 10kg to 20kg, the shipping will cost 6Euro. So thats my problem, i don’t know how to make this possible. Please can you help me.. thank you.

ciao Fabio