A simply supported beam spans $7\mathrm{.}5$ m $($measured centreline to centreline of supports$).$ Refer

to figure $1$ for cross$-$section details. Loads are given in the table below. The beam sits on

$200$mm thick concrete walls $($See figure $2$ for end support details$).$

$M^{*}$ is $282$ kPa $,$ bef $=1200mm,f^{\text{'}}c=32,$ def $=414mm,fsy=500$

Design the required flexural reinforcement for the maximum sag moment.