A rectangular steel tube having the cross section shown is used as a column of $14\mathrm{.}5-$ft effective length. Knowing that ${}_Y$

$=36$ksi and $E=29{10}^6,$ use load and resistance factor design to determine the largest centric live load that can

be applied if the centric dead load is $55$ kips. Use a dead load factor ${}_D=1\mathrm{.}2,$ a live load factor ${}_L=1\mathrm{.}6,$ and the

resistance factor $=0\mathrm{.}90.($Round the final answer to one decimal place.$)$