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Mathematics 7 Online
OpenStudy (anonymous):

Violet knows that her subscription rate for the basic tier of cable television increased from $18.20 to $19.50 at some point during the calendar year. She paid a total of $230.10 for the year to the cable company. Determine the month of the rate increase.

OpenStudy (anonymous):

y=9 mo at $19.50 x=12-y=3 mo at $18.20

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