$1-$ a$)$ Design a simply supported $4\mathrm{.}7$ m long rectangular beam to resist applied load of DL $=15k\frac{N}{m},LL=22k\frac{N}{m}.$ Use C$20,$S$420$; $d^{\text{'}}=4cm,h=65cm$ and $b_w=25cm.$ Choose $12$ bars,

b$)$ Can this reinforcement be placed as a single layer? Assume $2$ cm clear concrete cover and $\backslash$Phi $8$ stirrups and $20$ mm max aggregate size. If the selected reinforcement can not be placed as a single layer provide a solution $($either place as double layers$-$if it can be or select another reinforcement$).$Also draw the cross$-$section showing dimensions and all reinforcement.