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+// Example 11.6: (b) R2/R1
+//               (c) Amount of feedback in decibels
+//               (d) Vo, Vf, Vi
+//               (e) Decrease in Af
+clc, clear
+
+disp("Part (b)");
+A=1e4;
+Af=10;
+bta=(A/Af-1)/A; // Feedback factor
+R2_R1=1/bta-1; // R2/R1
+disp(R2_R1,"R2/R1 =");
+
+disp("Part (c)");
+dB=20*log10(1+A*bta); // Amount of feedback in decibels
+disp(dB,"Amount of feedback (dB) =");
+
+disp("Part (d)");
+Vs=1; // in volts
+Vo=Af*Vs; // in volts
+Vf=bta*Vo; // in volts
+Vi=Vs-Vf; // in volts
+disp(Vo,"Vo (V) =");
+disp(Vf,"Vf (V) =");
+disp(Vi,"Vi (V) =");
+
+disp("Part (e)");
+A=80*A/100; // Decreased A
+Af_dash=A/(1+A*bta); // Decreased Af
+C=(Af-Af_dash)*100/Af; // Percentage decrease in Af
+disp(C,"Percentage decrease in Af (%) =");
+\ No newline at end of file