AMC 10 Step by Step
2011 AMC 10AProblem 1P1-10~1 minPrint

A cell phone plan costs $20\$20 each month, plus 55 ¢ per text message sent, plus 1010 ¢ for each minute used over 3030 hours. In January Michelle sent 100100 text messages and talked for 30.530.5 hours. How much did she have to pay?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.