18. For the system shown in Figure P7.7, [Section: 7.4] a. What value of K will yield a WileyPLUS WPCS Control Solution steady-state error in position of 0.01 for an input of (1/10)r? b. What is the K,, for the value of K found in Part a? c. What is the minimum possible steady-state posi- tion error for the input given in Part a? R(s) E(s) K(s+7) s(s+5)(s+8)(s+12) C(s) FIGURE P7.7