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diff --git a/2459/CH12/EX12.13/Ex12_13.sce b/2459/CH12/EX12.13/Ex12_13.sce
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+//chapter12
+//example12.13
+//page250
+
+R1=50 // kilo ohm
+R2=10 // kilo ohm
+Re=1 // kilo ohm
+Vcc=12 // V
+Vbe1=0.1 // V
+Vbe2=0.3 // V
+
+V2=Vcc*R2/(R1+R2) // voltage across R2
+
+// for Vbe=0.1 V
+Ic1=(V2-Vbe1)/Re
+
+// for Vbe=0.3 V
+Ic2=(V2-Vbe2)/Re
+
+printf("for V_BE=0.1 V, collector current = %.3f mA \n",Ic1)
+printf("for V_BE=0.3 V, collector current = %.3f mA \n \n",Ic2)
+
+Vbe_change=100*(Vbe2-Vbe1)/Vbe1
+Ic_change=-100*(Ic2-Ic1)/Ic1 // negative sign since Ic decreases
+printf("comment : if V_BE changes by %.5f percent, \ncollector current changes by %.3f percent \n",Vbe_change,Ic_change)
+printf("so collector current is independent of transistor parameter variations \n")
+
+// the change in V_BE is 200 percent not 300 percent.It is mistake in textbook