I need a shipping calculator for a website. The customer will enter a postcode to see the shipping cost.
The calculation is: $20 + (weight x $rate) x1.2 x1.1 = Total shipping.
The $rate value changes for each shipping region and there is about 45 regions and each region has several post code ranges.
The weight will be a constant value, for example 20kg.
I can supply the post code, region and rate data in any format you want.