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ANSWER: 50.

EXPLANATION: 99 of the 100 students were present which means that one student was absent. Only 98% of blonde-haired students were present so we know the absent student was blonde (otherwise 100% of blonde-haired students would have been present). Let x be the number of blonde-haired students at Blondie High. 2% of blonde-haired students were absent:

(2/100) x = 1 (there was one student absent) therefore x = 1/0.02 = 50.

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