Income of 'D' is 80% more than the expenditure of 'E' and 300% more than the savings of 'F'. Expenditure of 'D', 'E' and 'F' is in the ratio 5:4:2, respectively. If the income of 'E' is 3 times the expenditure of 'F', then find the savings of 'E' given that the difference between the savings of 'D' and 'F' is Rs. 8,400.