Recently, Green Day, the Kings of Leon, and the Black Eyed Peas had concert tours in the United States. A large group of college students was surveyed, and the following information was obtained: 381 students saw Black Eyed Peas, 624 saw the Kings of Leon, 712 saw Green Day, 111 saw all three, 513 saw none, 240 saw only Green Day, 377 saw Green Day and the Kings of Leon, and 117 saw the Kings of Leon and Black Eyed Peas but not Green Day.
a. What percent of the college students saw at least one of the bands?
b. What percent of the college students saw exactly one of the bands?
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