Determine the cracking moment $(kN-m)$ for the section shown if $f^{\text{'}}c=28$ mPa and if the modulus of rupture $fr=0\mathrm{.}7\sqrt[\phantom{2}]{f^{\text{'}}c}.$ The final answer should have $2$ decimal places.

WHERE:

$b=307mm,h=461mm,$ bar $=28mm$

NOTE: Final answer should have $2$ decimal places