Meera distributed 70% of the money she had between 'C' and 'D' in the ratio 3:4 respectively. 'C' and 'D' deposited the amount received in a scheme offering 5% simple interest and 8% simple interest for four years respectively. Find the amount left with Meera if the difference in the interests earned by 'D' and 'C' after four years is Rs. 3,400.