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diff --git a/3637/CH2/EX2.27/Ex2_27.sce b/3637/CH2/EX2.27/Ex2_27.sce
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+//problem 27 pagenumber 2.109
+//given
+format(6);
+fa=200;//hz
+vi=2;//volt
+c1=0.1e-6;//farad
+//determine cf1 rf1 r1
+rf1=1/(2*3.14*fa*c1);clf();
+r1=1/(2*3.14*c1*fa*10);//fb=10*fa
+cf1=r1*c1/rf1;
+disp('Rf = '+string(rf1/1e3)+' Kohm');
+disp('R1 = '+string(r1)+' ohm');
+disp('Cf = '+string(cf1*10^6)+' μfarad');//error in book
+subplot(1,2,1);
+x=0:0.1:10*%pi;
+y=-2*sin(2*fa*3.14*x);
+plot(x,y);
+xlabel('time in sec');
+ylabel('Vi in volts');
+title('input waveform problem Ex2_27');
+subplot(1,2,2);
+x=0:0.1:10*%pi;
+y=-1.75*cos(2*fa*3.14*x);
+plot(x,y);
+xlabel('time in sec');
+ylabel('V0 in volts');
+title('output waveform problem Ex2_27');