A and B started a business with initial investments of Rs. 13000 and Rs. 20000 respectively. After one year, a profit of Rs. 8250 is earned. A being a working partner gets 28% of the profit for managing the business and rest of the profit is shared between them in the ratio of their investments. A invested his whole profit in a scheme offering 20% compound interest compounded annually. Find the interest earned by A after 2 years.