A man has two sons whose ages are 15 years and 13 years. The man has 4,50,000 rupees . He gives some money to his elder son and remaining to the younger son. If bank gives 5% interest to the elder son and 2% interest to the younger son and after completing 18 years of their ages the bank gives same money to both the sons then find what amount of money ( in rupees ) the man gave to his both sons.