how to do 20 log (p/pr)

calculate 20log10 ( 200/2*10^-5)
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step 1...1/2*10-5=(1/2)*(1/10^-5) =(1/2)*10^+5=0.5*10^5 or 5*10^4

200/2*10-5=200*5*10^4=10*10^6=10^7

log10(10^7)=7

20*log10910^7)=140
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