Just a thought ......
If both are lying, can we be sure that they will contradict?
So, is it better to mark 'None' for such a question always even if '.54' was one of the options?
This is almost like a CR question.
can you show an instance when both contradict while they are lying? I don't think both can contradict AND lie on the same question. Both CAN give diff. answers in their lies but not really contradict...
If they give diff. answers, ain't they contradicting each other...ofcourse they are contradicting the right answer, but do we assume that we know the correct answer?
In that case '.54' is correct.