A rectangular concrete beam measures 300 mm wide and has an effective depth of 450 mm. Compression steel consisting of two No. 25 (No. 8) bars is located 65 mm from the compression face of the beam. If f_c = 28 MPa and f_y = 420 MPa, what is the design moment capacity of the beam, according to the ÁCI Code, for the following alternative tensile steel areas? 

(a) A = three No. 32 (No. 10) bars in one layer, 

(b) A_s = four No. 32 (No. 10) bars in two layers, 

(c) A_s = six No. 29 (No. 9) bars in two layers. (Note: Check for yielding of compression steel in each case.) Plot M_n versus p and comment on your findings.