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Mathematics 12 Online
OpenStudy (anonymous):

The demand for your college newspaper is 9,000 copies each week if the paper is given away free of charge, and drops to 8,000 each week if the charge is 10¢/copy. However, the university is prepared to supply only 600 copies per week free of charge, but will supply 1,400 each week at 20¢ per copy.

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