A rectangular beam 250 mm wide, 500 mm deep is reinforced at the bottom with 4-20-mm-diameter bars and at the top with 2

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A rectangular beam 250 mm wide, 500 mm deep is
reinforced at the bottom with 4-20-mm-diameter
bars and at the top with 2-16-mm bars. Concrete
cover to bar centroid at the top is 80 mm and at the bottom is 70 mm. Use concrete strength f'c = 21 MPa and steel yield strength fy = 415 MPa for 20-mm bars and fy = 275 MPa for 16-mm bars.
Determine the ULTIMATE MOMENT CAPACITY in
kN-m of the beam in negative bending.
A. 45.07
B. 47.55
C. 40.56
D. 42.79