The Block diagram for a control system is shown below:

Step 1: Use the steady-state error formula for a control system.
For a unit step change in the input, the steady-state error can be found by applying the final value theorem or evaluating the system's response at steady state.
Step 2: Conclusion.
The steady-state error for the given system is 0.4, so the correct answer is (C).
Given an open-loop transfer function \(GH = \frac{100}{s}(s+100)\) for a unity feedback system with a unit step input \(r(t)=u(t)\), determine the rise time \(t_r\).
Consider a linear time-invariant system represented by the state-space equation: \[ \dot{x} = \begin{bmatrix} a & b -a & 0 \end{bmatrix} x + \begin{bmatrix} 1 0 \end{bmatrix} u \] The closed-loop poles of the system are located at \(-2 \pm j3\). The value of the parameter \(b\) is: