Rates

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?

Your answer:

m3



Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 2 comments:
#1
Thomas
Your Website is very helpful, but why is it called "hackmath.net"

#2
Dr Math
we think that maybe "hacking mathematics" or "play with mathematics". All relevant domains is occupied.

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