A $250 \mathrm{~mm}$ wide $\times 600 \mathrm{~mm}$ deep rectangular concrete beam is prestressed by means of $4$ high-tensile tendons, each of $14 \mathrm{~mm}$ diameter. The centre of the tendons is $200 \mathrm{~mm}$ from the soffit of the beam. The effective stress in each tendon is $700 \mathrm{~N} / \mathrm{mm}^{2}$.
The maximum bending moment (in $\mathrm{kN}-\mathrm{m}$ ), that can be applied to the section without causing tension at the soffit of the beam due to prestressing only, is $\_\_\_\_$ (rounded off to one decimal place).
Use $\pi=3.14$
