Number between 2 numbers

good morning,
in one label I have to make a choice of a number between 100 and 200 and in the other with a click button you have to give me 20 euro as a result.
but if that number is between 200 and 300 it must be 15 euros. how should I write the source, I can not
thank you

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Maybe something this might help you

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grazie mille
thanks

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