Design rectangular section for the beam, loads, and p values shown. Beam weight is not included in the loads given. Show sketches of cross sections including bar sizes, arrangements, and spacing. Assume concrete weight 23.5 kN/m³, fy = 420 MPa and f'c =28 MPa PL = 100 kN WD = 25 kN/m -6 m- 12 m -6 m- p = ½Pb