Adwords - adsense earnings tracking

Hello,

I was just wondering if there is any tool (way) to track how much money adwords campaigns produce via adsense.

For example, I have a classifieds website, I create an adwords campaign for keyword "free ads". Then some visitor clicks on adwords link (costs me 50c let's day), he posts on my website a free classified that will produce from other visitors 1$ => profit = 50c

So I need a report that will say: campaign x = cost 50 usd, adsense from campaign x = 10000 impressions, 200 clicks, 30 usd earnings.

Is there such a tool? Or would you be intereseted in one, cause Im thinking to develop one.