How to calculate CPC based on ROI?

[Robbin207]

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....

 

[-God-]

$14 give or take.

 

[Robbin207]

(.)_(.) Close enough.