Asymmetric I-section of size 180 mm × 40 mm, 8 mm thick is strengthened with 240 mm × 10 mm rectangular plate on top flange as shown in Fig. below. If permissible stress in the material is 150 N/mm^2, determine how much-concentrated load the beam of this section can carry at centre of 4 m span. Given ends of the beam are simply supported.

240 mm 10 mm 8 mm thick 400 mm 180 mm