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+//chapter13
+//example13.12
+//page286
+
+R1=150 // kilo ohm
+R2=20 // kilo ohm
+Re=2.2 // kilo ohm
+Rc=12 // kilo ohm
+Vcc=20 // V
+Vbe=0.7 // V
+
+V2=Vcc*R2/(R1+R2) // voltage across R2
+Ve=V2-Vbe // voltage across Re
+Ie=Ve/Re
+re_dash=1d-3*25/Ie // in kilo ohm
+Av=Rc/re_dash
+
+printf("voltage gain = %.3f \n",Av)
+
+// the accurate answer is 360.642