Imagine a large$-$scale kitchen operation such as the Mandarin, Boston Pizza, or Swiss Chalet. Even though restaurant customers might experience a relatively quiet, comfortable, and relaxing atmosphere out front, in the kitchen area there are many physical agents that can impair the safety and health of kitchen workers and servers.

Refer to Scenario $5-1$: There are four mechanical dishwashers in the kitchen running at the following sound ratings: $82$ dB$,84$ dB$,86$ dB$,$ and $88$ dB$.$ A $2$ dB difference translates to a noise factor increase of $2\mathrm{.}1$ dB$,$ a $4$ dB difference to a factor of $1\mathrm{.}5,$ and a $6$ dB difference to a factor of $1\mathrm{.}0.$ Given this information, what is the total noise level coming from the dishwashers?

Question $13$ options:

a$)$

$85\mathrm{.}0$ dB

b$)$

$87\mathrm{.}5$ dB

c$)$

$89\mathrm{.}0$ dB

d$)$

$86\mathrm{.}1$ dB