When gas consumption, the consumer may choose one of two rates:
  1. rate A - which pays 0.4 € per 1 m3 of gas a flat monthly fee of 3.9 € (regardless of consumption)
  2. rate B - which pays 0.359 € per 1 m3 of gas a flat monthly fee of 12.5 €

From what monthly consumption is more convenient for the customer rate B?


x =  209.8 m3


Solution in text x =

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