A timber beam of rectangular section 100 mm x 60 mm is simply supported at the ends, has a 40 mm x 10 mm steel strip securely fixed to the top surface as shown in the given figure. (Modular ratio = 20). k 40 mm Timber 60 mm 100 mm The centroid of the equivalent timber beam in this case from the top surface is (a) 55 mm (c) 28.57 mm (b) 5 mm (d) 33.57 mm