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n = 1 -->TI = 80 dB
n' = 5 --> TI' = --- ?
TI' = TI + 10 log n'
.....= 80 + 10 log 5
.....= 80 + 10 log (10/2)
.....= 80 + 10 (log 10 - log 2)
.....= 80 + 10 (1 - 0,30)
.....= 80 + 10 (0,70)
.....= 80 + 7
.....= 87 dB..<-- jawaban
n = 5
ditanya :TI(n = 5)
TIn = TI + 10 .log n
TI(n = 5) = 80 + 10 .log 5
= 80 + 10 .(log (10 : 2)
= 80 + 10 .(log 10 - log 2)
= 80 + 10 ( 1 - 0,3)
= 80 + 10.(0,7)
= 80 + 7
= 87 dB