Question

As a result of the installation of a muffler, the noise level of an engine was reduced from 89 to 72 decibels. Find the percent decrease in the intensity level of the noise due to the installation of the muffler.(Round your answer to the nearest whole number

Answer 1

Explanation:

Using the formula

Initial -final/initial =%/100

89-72/89 =%/100

17/89 =%/100

Making %subject of the formula

% =17*100/89

So % =1700/89

%= 19.101

Therefore rounding off the answer we have

X=19%