The ranks of the most expensive colleges have grown again: 100 institutions are charging $50,000 or more for tuition, fees, room, and board in 2010-11, according to a Chronicle analysis of data released last week by the College Board. That's well above the 58 universities and colleges that charged that much in 2009-10, and a major jump from the year before, when only five colleges were priced over $50,000.

This year marks a milestone as the first public institution has joined that elite club: the University of California at Berkeley is charging out-of-state residents $50,649 for tuition, fees, room, and board. (The price for in-state residents is only $27,770.)

All of the other 99 colleges charging $50,000 or more are private. They made up 9% of the 1,058 private institutions reporting any amount for tuition, fees, room, and board.