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diff --git a/2885/CH8/EX8.7/ex8_7.sce b/2885/CH8/EX8.7/ex8_7.sce
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+//Calculate the input and output impedance and voltage gain
+clear;
+clc;
+//soltion
+//FUNCTIONS
+
+function [z]=prll(r1,r2)//Function for the parallel combination of resistor
+    z=r1*r2/(r1+r2);
+endfunction
+
+hie=1.1*10^3;//ohm      = rin
+hfe=120;//    = B
+
+//the values of Rac2, Zi, Zo are as per diagram
+Rac2=prll(3.3*10^3,2.2*10^3);
+Rac1=prll(6.8*10^3,prll(56*10^3,prll(5.6*10^3,1.1*10^3)));
+Zi=prll(5.6*10^3,prll(56*10^3,1.1*10^3));
+Zo=prll(3.3*10^3,2.2*10^3);
+
+printf("Input Resistance = %.3f kΩ\nOutput Resistance = %.2f kΩ\n",Zi/1000,Zo/1000);
+
+Am2=-hfe*Rac2/(hie);
+Am1=-hfe*Rac1/(hie);
+Am=Am1*Am2;
+Am=20*log10(Am);
+printf("The Overall Voltage gain is %.2f dB",Am);