Assertion (A): The present population of a town decreases at the rate of 5% p.a. due to migration. Its present population is 21,600 and 2 years ago it was 24,000. Reason (R): Let there be an increase in population at R% p.a. Then population after n years is given by P (1- r/100), where P is the present population. 1. A is true, R is false 2. A is false, R is true 3. Both A and R are true 4. Both A and R are false