$(12\mathrm{.}5$ Points$)$

Centroid.

Determine the plastic centroid of the ${14}^{\text{'}\text{'}}{20}^{\text{'}\text{'}}$ column section with ${2\mathrm{.}5}^{\text{'}\text{'}}$ cover and $2$#$9$ top reinforcement and $4$#$9$ bottom reinforcement if $f_c^{\text{'}}=4$ksi and $f_y=60$ksi $?$

$$ Q$3$