Q: At a rock concert, the band controls music using a knob with integers 1 through 10 on it. Each increasing integer doubles the sound intensity. When the knob points to 4, the sound is 45 decibels. Which of the following is closest to the decibel level if the knob is increased to 9?
A		52
B		60
C		80
D		125

Sound | Quantitative Skills |