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Mathematics 21 Online
OpenStudy (anonymous):

5 text messages cost $1 and 20 messges cost $4. what is rate of change of cost per message?

OpenStudy (kc_kennylau):

$0.2/msg

OpenStudy (anonymous):

how did you get .20

OpenStudy (kc_kennylau):

$1/5msg=$0.2/msg

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