How much Adsense pay per click

I have a site that sells product (I’m going to launch it again). I use the same keywords. I see always the same ads. Sometimes I get 10.4 $ per click and sometimes 0.07 $ per click.

What’s the matter? How much Adsense pay per click?

It doesn’t depend on the keywords but on the advertiser itself.

How to increase the pay per click?

It increase with you page rank and with your traffic.

Don’t forget USA click are better because USA surfer and high internet buyers.