Thanks for the feedback.
Well, if you can find the total no. of call minutes generated per minute, then you can easily find the revenue by multiplying it by your tariff. Once you know the total minutes for all calls, I don’t see why you need to divide it by the total no. of subscribers.
Concerning the calculation with traffic, I was just answering your question, which was “how to translate erlang into financial terms”. You can easily factor in data revenue (GPRS/EDGE), if you know the charging method.
Anyway, I’m glad you got your answers.