for the smart ppl

hi im @ school and im making a report about sound and stuff and i need to answer some questions but i dont know how to do question6. this is the question:

on a podium are 1 little guitaramplifier (versterker in dutch) from 20w and 1 PA-tower from 2000W. how much decibel (dB) produces the PA-tower more in sound?

if you know the correct answer with calculation plz post it :p
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