$($id:$123972)$

What is the ampacity of an $8$ AWG THHN when installed with $23$ other $8$ AWG THHN copper current$-$carrying conductors in a metal wireway in an area with an ambient temperature of $30C?$

a$.22\mathrm{.}5$ A

b$.24\mathrm{.}75$ A

c$.50$ A

d$.55$ A