$3.$ An industrial worker is exposed to the following noise levels during an $8-$hour work shift: $80$ dBA for $4$ hrs$,85$ dBA for $2$hrs$,90$ dBA for $1$ hr and $95$ dBA for $1$ hr$.$ Calculate the combined effect or the daily noise dose, $($OSHA permissible exposure levels for duration$/$day are: $80$ dBA~ $16$ hrs$,85$ dBA$-8$ hrs$,90$ dBA $-4$ hrs and $95$ dBA $-2$ hrs$.).$ Is the daily noise acceptable? If this is not, then what should be done?