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In a pre-stressed concrete beam section shown in the figure, the net loss is $10 \%$ and the final pre-stressing force applied at $X$ is $750$ kN. The initial fiber stresses (in $N/mm^2$) at the top and bottom of the beam were:

  1. $4.166$ and $20.833$
  2. $ – 4.166$ and $ – 20.833$
  3. $4.166$ and $ – 20.833$
  4. $ – 4.166$ and $20.833$
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