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diff --git a/1529/CH21/EX21.15/21_15.sce b/1529/CH21/EX21.15/21_15.sce
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+//Chapter 21, Problem 15
+clc;
+e1=200;                         //primary voltage
+e2=400;                         //secondary voltage
+v2=387.6;                       //secondary terminal voltage
+reg=((e2-v2)/e2)*100;           //regulation
+printf("Regulation = %.1f percent",reg);