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Mathematics 17 Online
OpenStudy (anonymous):

Jairo and his brother have a cell phone plan that charges them $5 for 200 text messages per month for each of their phones plus an additional $0.12 for each additional text. Their carrier has offered them unlimited text messages for both lines for $30 per month. What is the maximum number of text messages they can send in a month to keep their current plan as the better deal? The minimum?

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