Q. To find out the total compound interest accured on a sum of money after 5 years, which of the following informations given in the statements P and Q will be sufficient ?P : The sum was Rs. 20000.Q : The total amount of simple interest on the sum after 5 years was Rs. 4000?  

1. only P is sufficient
2. Only Q is sufficient
3. Either P or Q is sufficient
4. Both P & Q are needed