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+
+// Ex4_22
+clc;
+// Given:
+t=6.01;// in hours
+// Solution:
+ar=100/5;// activity ratio given that 5% of intial activity
+k=0.693/t;
+
+t1=(log(ar))/k;
+printf("The time required will be %f h",t1)
+
+
+