Answer:
Here,
transmission path = 5 km
Loss suffered in transmission path
=-2dBkm-1 x5km=-10dB
Total amplifier gain = 10 dB + 20 dB = 30 dB
Overall gain of signal = 30 dB -10 dB = 20 dB
As, Gain in dB = 10 log 10 (P0/Pt)
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