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+//Example 21.1    
+clc;
+
+//Given data
+Em=0.013;          //in amperes
+Eref=0.010;        //in amperes
+Emax=0.02;         //in amperes
+Emin=0.004;        //in amperes
+//percentage error
+Ep=(Em-Eref)*100/(Emax-Emin);
+disp(Ep,'Percentage error in measurement');
+\ No newline at end of file