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diff --git a/147/CH8/EX8.20/Example8_20.sce b/147/CH8/EX8.20/Example8_20.sce
new file mode 100644
index 000000000..f155fbe17
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+++ b/147/CH8/EX8.20/Example8_20.sce
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+//input resistance hie, reverse voltage ratio hre
+//forward current gain hfe, output admittance hoe
+close();
+clear;
+clc;
+Rc = 800;//ohm
+Rl = Rc;
+Ri = 0;
+R1 = 1200;//ohm
+R2 = 2700;
+hre = 0;
+hoe = 100*10^(-6);//s
+hfe = 90;
+hie = 200;
+Rb = R1*R2/(R1+R2);
+syms ib;
+il = -(Rc/hoe)/(Rc/hoe+Rl/hoe+Rl*Rc)*hfe*ib;
+Av = dbl(Rl*il/(hie*ib));
+//Current gain 'Ai'
+Ai = dbl(Rb/(Rb+hie)*il/ib);
+mprintf('Voltage gain Av = %0.2f\nCurrent gain Ai = %0.2f',Av,Ai);
+\ No newline at end of file