Use the following information for determining sound intensity. The number of decibels of a sound with an intensity of I watts per square meter is given by
= 10 log(I/I0),
where
I0
is an intensity of
10−12 watt
per square meter, corresponding roughly to the faintest sound that can be heard by the human ear.

Due to the installations of noise suppression materials, the noise level in an auditorium was reduced from 94 to 85 decibels. Find the percent decrease in the intensity level of the noise as a result of the installation of these materials. (Round to the nearest whole number.)
%