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100 percent is 0 dB.50 percent is - 6 dB.45 percent is -6.935749724 dB.10 percent is - 20 dB.
It is difficult to be specific because busy street traffic and quiet radio are not standard volumes of sound.However, a quiet radio - at around a "normal" conversation level is 60 decibels (dB). A busy street is can range from the low 70 to high 80 dB. Let us say 80 dB.The difference is 20 dB = 2 Bels. This means the street is 10^2 = 100 times as loud.
70 dB is 10 times louder than 60 dB.