The following picture should give you quite a but of useful information about Google’s Pay Per Click advertising. (Organic is what appears in the main area after a Google search, i.e. not at the top or on the right.) Click on the image to see it bigger.
This interesting picture was borrowed from http://inspirationfeed.com/inspiration/infographics/google-ads-vs-organic-results-infographic/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+inspirationfeed%2FBTLD+(inspirationfeed.com