As shown in figure. The width $b=9\mathrm{.}0$ in$.,$ thickness $t=1\mathrm{.}25$ in$.,$ and $a=5\mathrm{.}0in.$ Given that the axial load is $P=200lbs,$ determine $($a$)$ the normal stress that acts perpendicular to the inclined plane and $($b$)$ the shear stress that acts parallel to the inclined plane.