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+//===========================================================================
+//chapter 8 example 3
+
+clc;clear all;
+
+//variable declaration
+T     = 0.5;			//time in hours
+V       = 220;		//voltage in V
+I        = 5;			//current in A
+P      = 525;			//consumption registered in Wh
+P1      =0.525;			//consumption registered in kWh
+
+//calculations
+
+E      = ((V*I)/(1000))*T;		//energy consumed in kWh
+e      = ((P1-E)/(E))*100;		//percentage error in %
+
+//result
+mprintf("percentage error  = %3.2f percentage(slow) ",e);