diary on
s=tf('s')
 
Transfer function:
s
 
P=40/(s^2+15*s+50)
 
Transfer function:
      40
---------------
s^2 + 15 s + 50
 
G=(1+0.05*s)
 
Transfer function:
0.05 s + 1
 
K=61.25

K =

   61.2500

H=K*G*P/(1+K*G*P)
 
Transfer function:
   122.5 s^3 + 4288 s^2 + 42875 s + 122500
---------------------------------------------
s^4 + 152.5 s^3 + 4612 s^2 + 44375 s + 125000
 
step(100*H)
diary off