# 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(9135)   (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