A boy on being asked what $6\over 7$ of a certain fraction was, made the mistake of dividing the fraction by $6\over 7$ and so got an answer which exceeded the correctanswer by $13 \over 70$ . Find the fraction
A, B and C enter into a partnership with a total capital of Rs. 8200. A's capital is Rs. 1000 more than B's and Rs. 2000 less than C's. At the end of the year what is B's share in the profit of Rs. 2460?