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If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is

0.496%
0.596%
0.696%
0.796%
none of these.

Correct Answer: 0.696%

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