An I$-$section girder has a web $600$ mm x $12,5$ mm and flanges $300$ mm x $25$ mm$.$ The girder must withstand a bending moment of $300$ kN$.$m and a shear force of $1$ MN at a particular section. Determine $($a$)$ the maximum bending stress induced in the section; $($b$)$ the maximum shear stress induced in the section due to the shear force only; $($c$)$ the percentage of the shear force carried by the web; $($d$)$ the percentage of the bending moment carried by the flanges.