Nice Puzzle about the equal distribution of amount

This is a story of four boys........ ........... . Chinku, Dinku, Pinku & Tinku.




One day all of them decide to save their money in a bank......they select a bank called " Lena Bank "



The bank's specialty is: In every month the money gets doubled.



In 2nd month, Chinku withdraws 100-Rs from bank........ ...

In 3rd month, Dinku withdraws 100-Rs from bank........ ......

In 4th month, Pinku withdraws 100-Rs from bank........ ....&

In 5th month, Tinku withdraws 100-Rs from bank & their balance in the bank becomes zero........ ......... ...

How much amount had the boys put in the bank?