how ptc site referrl earing calculates.

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i am thinking to open ptc site but i dont understand how admin earn money . like admin asking 2$ for 100 views from advertiser and paying user a 1cent and 1cent to referr also fro example 1 user click 1 ad and earn 1 cent he has 5 referr and all of them clicked same ad and earn 1cent each then user also get 5 cent because of its referr so in short on 6 click admin is giving users a 11 cents per 6 click . well its real hard for me to understand this calculation how admin earn on these sites if any one is runing ptc site please do share you information how much you earn and how this referr earing calculation works i real want to know this . cheers.