TOPIC: Fee field Question

I'm setting up a cycling event where the user can register for it for a fee. Say $50. I have set up a field for "Tandem" using the radio buttons saying yes or no.
If they select yes to this it needs to add the cost of tandem (say $100) to the event cost to show the user total cost of $150

I have selected the Fee Field and inputted $100 in the field that says Fees. But it wont add them together.

Have I missed something?

First, depending on how you have done things... after making your field changes, it's possible that you just need to re-save your event to get everything properly applied. Try that first.

If that doesn't help, then you probably have something setup wrong. See this video tutorial on selection fields as it will be a big help on things like this:

http://www.youtube.com/watch?v=cuB1qwx4pJo

Also possible that the functionality is being broken due to a conflict with something else. Make sure you don't have any script compressors, replacers, etc running from your template or another plugin.

To get I high google page speed ranking I do run a compressing system.
However I can exclude files from it.
What files would I need to list so it bypasses it please.

You must exclude anything in /components/com_dtregister/assets/js