How to perform calculation inside Configurable List Widget ?

Is there a way I can dynamically calculate Shipping Cost by the following formula for each row?

(Qty x Unit Price) + 30% if Currency is NOT QAR ?

It would be great if the value got automatically updated in that field every time data was added. Any way to make that conditional logic work?

Unfortunately, I could not find a way to do it,I think the only way would be creating a custom JavaScript code , you would need to get the source code of your Form.

http://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form

Then you can create the JavaScript code and achieve that you want.