How many watts should a bass amp have for say, a concert of 100 people?!

Question: How many watts should a bass amp have for say, a concert of 100 people!?
Answers:

minimum of 100 watts but u want more watts than your guitar player so it levels out rightWww@Enter-QA@Com

100 watts RMS - with 2 to 4 15" speakers!. Twelves would work too!.!.Www@Enter-QA@Com

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