I will tell you the truth, it is difficult but if you are patient like I am you can not only reach it, but go over it too. I will tell give you some tips to increasing your revenue.
- Make sure you have 3 to 4 ad units on your page. Make sure the ad units are mixed images and text.
- Make sure you get enough search engine traffic, or figure out ways to increase your search engine traffic.
- Make sure you place your ads where they can be seen easily. Close to your main content.
Picture above is 4 months ago and picture below is now January 2014.