Task $7$: Use Australian Standards AS $3600$ and relative code to design the reinforcement beam's loads, moments, shear forces and design ultimate strength theory for bending using rectangular stress block with first principles of the moment capacity. Please detailly to show all the calculation process.

Moment Capacity of a singly reinforced Section

The moment capacity of the section shown below is to be calculated using the limiting strain criterion eu $=0\mathrm{.}003$ and the AS$3600$ rectangular stress block. The concrete strength $f^{\text{'}}c$ is $40$MPa and $y=0\mathrm{.}766$