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+// Exa 1.27
+clc;
+clear;
+close;
+// Given data
+Ao= 86;// in dB
+A= 40;// in dB
+f=100;// in kHz
+f=f*10^3;// in Hz
+// From  20*log(S) = 20*log(Ao/A), where S, stands for sqrt(1+(f/fb)^2)
+S= 10^((Ao-A)/20);
+// S= sqrt(1+(f/fb)^2)
+fb= f/sqrt(S^2-1);// in Hz
+Ao= 10^(Ao/20);
+ft= Ao*fb;// in Hz
+disp(Ao,"The value of Ao is : ")
+disp(fb,"The value of fb in Hz is : ")
+disp(round(ft*10^-6),"The value of ft in MHz is : ")