If the area of tensile steel reinforcement is doubled in a singly reinforced beam, the moment of resistance of the beam increases by about

Why is this the answer?

In a balanced or under-reinforced section, the moment of resistance is proportional to the area of steel (Ast) multiplied by the lever arm (d - n/3). While doubling Ast increases the force component, the neutral axis depth (n) also increases, which slightly reduces the lever arm. The net increase in moment of resistance is approximately 32%.

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