An all$-$day study at a manufacturing company revealed the following noise sources: $0\mathrm{.}5$ hrs$.,100$ dBA; $1$ hr$.,$ less than $80$ dBA; $3\mathrm{.}5$ hrs$.,90$ dBA; $3$ hrs$.,92$ dBA. Consider that the last exposure is in a press room which currently has five presses operating. Assuming the company can eliminate some of the presses and transfer production to the remaining presses,

What is the combined noise level of the $5$ presses?

What is the combined noise level of $4$ presses $($ie$.$ after one press is eliminated$)?$

What is the combined noise level of $3$ presses?

What is the combined noise level of $2$ presses?

What is the noise level of $1$ press?

What is the noise dose percentage with $1$ press eliminated?

What is the noise dose percentage with $2$ presses eliminated?

What is the noise dose percentage with $3$ presses eliminated?

What is the noise dose percentage with $4$ presses eliminated?

How many presses should the company eliminate so as not to exceed $100\%$ dose exposure for the workers?