The loudness of a sound is related to the logarithm of the ratio of the measured intensity, I, to a reference intensity, I. The loudness, L, of a sound is measured in decibels, dB, and can be determined using the formula L = 10log10 (I/Io)). If the intensity of the sound of a rocket launching is 4500 times that of a jet engine and the rocket has a loudness of 170 dB, then the loudness of the jet engine, to the nearest decibel, is