A basic cellular package costs $20/mo. for 60 min of calling, with an additional charge...
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A basic cellular package costs $20/mo. for 60 min of calling, with an additional charge of 20+.30 (x - 60). If you have $0.20/min beyond that time. The cost formula would be C to keep your bill $80 or lower, what is the maximum calling minutes you can use?
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