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Mathematics 13 Online
OpenStudy (anonymous):

On Chatty Cathy’s cell phone plan she pays for minutes used plus a fixed monthly charge. For 500 minutes she pays $12 plus the fixed charge. For 1500 minutes used she pays $30 plus the fixed charge. If her total monthly bill was $86.50 for 1750 minutes used, what is her monthly fixed charge? A) $50.50 B) $54.00 C) $55.00 D) $56.50

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