SOLUTION: Rate Increase. Patricia knows that at some point during the calendar year her basic monthly telephone rate increased from $17.10 to $18.40. If she paid a total of $207.80 for basic
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Question 274010: Rate Increase. Patricia knows that at some point during the calendar year her basic monthly telephone rate increased from $17.10 to $18.40. If she paid a total of $207.80 for basic telephone service for the calendar year, in what month did the rate increase take effect?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1710x+1840y=20780
x+y=12
x=10 and y=2
Rate increase took effect in November
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