The drawing below shows the bean $(B)$ and girder $(G)$ layout for a small one$-$story office building. if $D=$

$7$ ft and $L=20ft,$ what is the tributary area for

girder G$-2?$

$360f{t}^2$

$280$ft$^2$

Can not be determied with knowing the loads $($LL$,$ DL$)$

$210f{t}^2$

$420f{t}^2$