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+//Chapter 21, Problem 27
+clc;
+v1=200;                         //primary voltage of transformer 1
+v2=150;                         //secondary voltage of transformer 1
+v3=500;                         //primary voltage of transformer 2
+v4=100;                         //secondary voltage of transformer 2
+x=v2/v1;
+V=(1-x)*100;
+y=v4/v3;
+W=(1-y)*100;
+printf("(a) 200V:150V transformer,\n Volume of copper = %d percent\n",V);
+disp("Hence the saving is 75%");
+printf("\n\n(b) 500V:100V transformer,\nVolume of copper = %d percent\n",W);
+disp("Hence the saving is 20%.");