Solve Problem $4\mathrm{.}9$ except change problem as noted below. $(16$ points$)$

Change all horizontal width values to $2$ in $($were $3$ in$),$ change thickness of bottom strip to $3$ in $($was $2$ in$),$ and change the distance between the each support and load to $50$ in $($e$.$g$.$ distances AB$,$ CD; was $40$ in$).$

NOTE: The moment in region BC is equal to $750$ in$-$kip $[=(15$ kips$)(50$ in$)].$

$4\mathrm{.}9$ Two vertical forces are applied to a beam of the cross section shown. Determine the maximum tensile and compressive stresses in portion $BC$ of the beam.