How to increase trade route profit?

[Tecibbar]

I would like my trade route to double base profit, any easy way to mod? thankx.

 

[Terxpahseyton]

Go to Assets/XML/GameInfo and open "CIV4WorldInfo.xml",
There you will find the tag

<iTradeProfitPercent>30</iTradeProfitPercent>

There is one tag for every world size with a different number. I think simply raising all those numbers by two would do the trick.