# 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?

Correct result:

x =  209.8 m3

#### Solution:

$\ \\ 0.4 x + 3.9 > 0.359 x + 12.5 \ \\ \ \\ x > \dfrac{ 12.5-3.9 } { 0.4-0.359 } \ \\ x > 209.8 \ \text{m}^3$ Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

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