It's an average, they don't pay you that amount. For instance, if you earn $25 by sending 50 clicks, it would say that your EPC is $50 (based on your current traffic, you'd earn an average of $50 for every 100 clicks).
CJ calculates EPC (they invented it) as [[commission/clicks]*100]. Direct Track uses eCPC which is [commission/clicks]. EPC is used to value your traffic, important if you are sending PPC traffic.