The unit used for measuring the intensity of sound is decibel. The faintest sound that the human ear can detect is assigned a value of 0 decibels. Study this table and answer the question. Psychologists believe that if one sound source has10 times the power of another sound source, we hear the first about twice as loud - thus its decibel value will be double. If the decibel value of the sound from a 50W source is 60 dB, what would be the approximate decibel value of the sound from a loud 2500W source?

Decibel	Example	Maximum safe exposure
0	the quietest sound that you can hear	(Safe)
30	whisper, quiet library	(Safe)
60	normal conversation, sewing machine, typewriter	(Safe)
90	tools in a workshop, truck traffic	8 hours per day
100	Chainsaw, pneumatic drill	2 hours per day
115	sandblasting, loud rock concert, auto horn	15 minutes per day
140	loud gunshot, jet engine: noise causes pain and may injure unprotected ears	Maximum allowed noise with a hearing protector