The maximum bending stress induced is

Question

A beam of rectangular section (12 cm wide ´ 20 cm deep) is simply supported over a span of 12 m. It is acted upon by a concentrated load of 80 kN at the mid-span. The maximum bending stress induced is

 (a) 400 MPa                    (b) 300 MPa   

(c) 200 MPa                    (d) 100 MPa