$3-$ The plate shown below $($Fig$.$ I$)$ is subjected to four parallel loadings. Determine the magnitude of the single equivalent resultant force $(F_R)$ and it's y location $(y)$ as shown in $($Fig$.$II$).$

$($I$)$

$($II$)$

$($a$)F_R=23kN,y=6\mathrm{.}79m$

$($b$)F_R=23kN,y=4m$

$($c$)F_R=35kN,y=15\mathrm{.}2m$

$($d$)F_R=35kN,y=11\mathrm{.}5m$

$($e$)$ None of the above