This is very simple to do if you link your google adsense with google analytics they recently introduced the ability to connect the two giving your the ability to view which hubs are making you money and which ones may need a bit of work to get you more clicks.
Goto your google analytics page, click view report against your hubpages website profile
Now where it says content Overview click view report
Now on the left hand side you will see adsense if it has been setup, click that and it will show you which hubs are making you money. If you dont see anything try changing data range for the dates. There is also a section called adsense trends to show an increase in clicks on decrease happening:) goodluck hope that helped
(for me I enabled this when I saw a little highlighted message when browsing my adsense account)