As per the given question,
Frequency of the audio signal (fc)=20kHz
Frequency of the signal (fs)=100kHz
Amplitude of the carrier signal =10V
Modulation index =0.8
modulating frequency fm=0.8fs×10V=0.8100kHz×10=1250kHz
Lower band frequency =fs+fc=120kHz
upper band frequency =fs−fc=100kHz−20kHz=80kHz
Hence the required ratio=80kHz120kHz=3:2
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