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18 February, 17:11

For her birthday, Sarah's parents got her a new phone. The phone's plan costs $59.99 a month and allows for unlimited calls, unlimited web access, and 100 text messages a month. In addition, each text message over the 100 included with the plan is $0.10. If Sarah's parents budget $78.00 a month for her cell phone bill, what is the maximum number of text messages that she can send in one month?

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  1. 18 February, 18:36
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    78.00 = 59.99+0.10x

    10.01=0.10x

    x = 180.1 so she can send 180 texts plus the 100 free ones for a total of 280 texts

    double check: 180 x 0.10 = 18.00 + 59.99 = 77.99
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