i've been optimizing my brother's business website for a while now. its in the first page for 5 of its major keywords, all of them have more than 4000 global searches each month. 3 of the keywords have cpc of $2.5 and 2 has $3.5. now i've been working to get the website to the top 3 rankings on google. so if i get into the top 3, how much could i earn through google adsense? just a rough estimate would be fine. never used adsense before so i was just curious.
thanx in advance..