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+//===========================================================================
+//chapter 3 example 7
+
+
+clc;clear all;
+
+//variable declaration
+er     = 0.01;              // limiting error 
+P      = 1000;              //power in watts
+P1     = 100;               // true power in watts
+
+//calculations
+dP     = er*P;              //magnitude of instrument error of the instrument watts
+eP     = (dP/(P1))*100;     //percentage limiting error at 100 W power in %
+
+//result
+mprintf("percentage limiting error at 100 W power = %3.2f percentage',eP);;
+