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Verified answer
TI’ = TI + 10 log n - 20 log ( r’ / r )TI’ = 30 + 10 log 100 - 20 log ( 20 / 2 )
TI’ = 30 + 10 . 2 - 20 . 1
TI’ = 30 + 20 - 20
TI’ = 30 dB