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diff --git a/3507/CH20/EX20.3/Ex20_3.sce b/3507/CH20/EX20.3/Ex20_3.sce
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+//chapter20
+//example20.3
+//page437
+
+// for power supply A
+V_NL1=30 // V
+V_FL1=25 // V
+
+regulation1=((V_NL1-V_FL1)/V_FL1)*100
+
+//for power supply B
+V_NL2=30 // V
+V_FL2=29 // V
+
+regulation2=((V_NL2-V_FL2)/V_FL2)*100
+
+printf("regulation for power supply A =%.3f percent \n",regulation1)
+printf("regulation for power supply B =%.3f percent \n",regulation2)
+
+if regulation1>regulation2 then
+        printf("thus, power supply B is better \n")
+    elseif regulation2>regulation1 then
+        printf("thus, power supply A is better \n")
+    else    printf("both are equally good \n")
+end