A cell phone plan has the following charges:
Basic service, including 100 minutes of calls :$20 per month
2nd 100 minutes of calls: $0.075 per minute
Any additional minutes: $0.10 per minute

What is the charge for 200 minutes of calls?
What is the charge for 250 minutes of calls?
Construct a piecewise function that describes the monthly charge C for x minutes of call.

asked by Christopher

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