An l$-$section is having both top and bottom flanges width as $100mm$ and $8$MCO$-3$ thickness as $11\mathrm{.}5mm.$ The width of the web is $7\mathrm{.}5mm$ and the overall depth of the section is $225mm.$ This I$-$section is used as a simply supported beam over a span of $12m$ to support a uniformly distributed load. If the maximum permissible bending stress is not to exceed $80$MPa, determine the uniformly distributed load.