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+//Chapter-5,Example 4,Page 123
+clc();
+close();
+
+t= 30 //time in minutes
+
+a=100
+
+x= 25
+
+k=(2.303/t)*log10(a/(a-x))
+
+t_half=0.693/k
+
+printf('the time of 50 percent completion of reaction is %.2f mins',t_half)