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I am extremely bad @ mathematics so excuse me for this stupid question. I tried to figure it out but after 10 minutes i gave up. Ok here is goes: Let's say i have a EPC of $0.50 and i want to get atleast a 50% ROI. How do i calculate what my maximum CPC may be? Thanks in advance....

How does facebook calculate CTR? I thought the formula was: Click / Impressions * 100. But if i use this formula, it does not match with what facebook shows me Why?

When i bid on facebook, they tell me for example that the Suggested bid is between: 0.06 - 0.09 USD. So normally when i bid .10 cents over i should get decent some traffic because i bid over the suggested bid. But lately i have to bid minimum .30 over the suggested bid before i get any traffic...