P/NP grading has one passing grade. UCB, like many schools, does not have ABC/F with three passing grades; it has ABCD/F with four passing grades as the base grading system. So it is not obvious that grade conversions under the ABC/F with three passing grades chart applies to this case.
If it is the case that P in P/NP grading = 2.0 (in which case AMCAS should more clearly state that), then that is a further deterrent against pre-meds being academically adventurous where there may be greater risk of not getting an A grade, since the option of taking grade-risky courses P/NP is not really an option.