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diff --git a/61/CH9/EX9.2/ex9_2.sce b/61/CH9/EX9.2/ex9_2.sce
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+//ex9.2
+V_in=176*10^-3;
+R_in=2.9*10^3;    //total input resistance from previous question
+A_p=42429;    //power gain from previous question
+V_CC=15;
+I_CC=0.6;    //emitter current
+P_in=V_in^2/R_in;
+P_out=P_in*A_p;
+P_DC=I_CC*V_CC;
+eff=P_out/P_DC;
+disp(eff,'efficiency')
+\ No newline at end of file