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+// Exa 5.17
+clc;
+clear;
+close;
+format('v',7)
+// Given data
+Zo =  12.6;// in k ohm
+Zo = Zo * 10^3;// in ohm
+A = 60;// in dB
+A = 10^(A/20)
+Zof = 500;// in ohm
+// Zof = Zo/(1+(A*Beta));
+Beta = ((Zo/Zof)-1)/A;
+disp(Beta,"The value of feed back factor is");
+// Part (ii)
+dAbyA= 20/100;// change in gain of basic amplifier
+dAf_byAf =dAbyA*1/(1+A*Beta)*100;//change in overall gain  in  %
+disp(dAf_byAf,"The change in overall gain for 20 % change in gain of the basic amplifier in % is");
+
+// Note: In the book, there is calculation error to find the value of dAf/Af