Hello, i have set the shipping method(and it works fine) but don't know how to do the last shipping method : from 100 till 120 cost=220$ ..... from 180 till 200 cost=300$ i can't do that --> "after 200 kilogram add 15$ for every 20 kilogram in the last price (300) so if the weight will be 220 the cost wil be 315, if it's 240 it will be 330. Any ideas? Thank u very much. Thomas