The full form of CPC is Cost Per Click. CPC is used a lot in online advertising. The CPC of any blog is not fixed. Because, CPC depends on the content. As will the content, so will the CPC. If someone writes about insurance, loan, finance or makes a video, then his CPC will be high. Because, advertisers spend more money on this keyword.
This is the reason that even after having 100000 views on a blog, its earnings are low, while some blogs make very good income even on 10000 views.