How to sum a list from App state

Actions & Logic

Hello I'm making a simple mileage calculator. I've checked a couple of resources on how to sum from a list in app state. I don't know how to. I've tried expressions and custom code but its not working. How can I sum from a list in app state?

What have you tried so far?

I have tried code expression and custom code.

Did you check FlutterFlow's Documentation for this topic?

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