I have no clue what percentage are admitted, but I do know the entire Haas class admitted per year is ~300 students, which includes ~80-100 transfer students. Obviously, the percentage is quite low all around.
Entering students in 2015 at Haas looked like this:
Entering class size: 358
Continuing UC Berkeley Students: 274
Transfer Students: 84
Average GPA for continuing students: 3.68
Middle 80% for continuing students: 3.39-3.93
Didn’t answer your question per se, but hopefully gave a little perspective to the pie as a whole.