Posted by Christina on Thursday, January 13, 2011 at 8:04am.
Kim is deciding between two cell phone plans. Plan A charges a fixed monthly fee of $100 for 1200 minutes and .25 per minute over 1200. Plan B charges a fixed monthly fee of $55 for 1000 minutes and .33 per minute over 1000. At what point of usage would Kim be indifferent between the two plans?

quant. methods  PsyDAG, Thursday, January 13, 2011 at 11:05am
100 + .25 (x1200) = 55 + .33(x1000)
Solve for x.

quant. methods  Christina, Thursday, January 13, 2011 at 11:45am
cant be

quant. methods  DrBob222, Thursday, January 13, 2011 at 3:26pm
gotta be!

quant. methods  Christina, Thursday, January 13, 2011 at 4:42pm
yes but how could it be 937.50 minutes when you will pay 100 or 55 dollars either way for 1200 or 1000 minutes. It would need to be over those minutes.
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