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+//Chapter-5,Example 5,Page 123
+clc();
+close();
+
+t_half=17 //half life period
+
+k=0.693/t_half //rate constant
+
+a=100
+
+x= 75
+
+t=(2.303/k)*log10(a/(a-x))
+
+printf('the rate constant is k = %.5f /min',k)
+
+printf('\n the time taken t = %.1f min', t)