It depends on a lot of factors, the niche you're promoting, the audience you're promoting to, and the platform.
For example for the same offer I ran on both adwords and facebook, and graphic lp gave me a 80% roi on facebook, but I needed a more informational style LP with more content on adwords for breaking even.
The only thing you can do is to test it yourself, or go out and see what other affiliates are doing.