Could anyone please help with this?

A radar controlled tracking system is described by the following diff eqn:

X''(o)+100X'(o)+10,000X(o)= 10,000X(d)

X(d)=angular position of the target (in radians)

X(o)=angular position of the tracker (in rads)

If the target is moving at a rate of 0.5rad/s i.e. X(d) = 0.5t rads

what will the steady state error E be, where E=X(d) - X(o)

Thanks in advance