A sum of Rs. 4,800 is divided between A, B and C such that the ratio of the share of A to the combined share of B and C is 3 : 5 and C receives \(\frac{5}{7}\) of what A and B together receive. The difference (in Rs.) of A's share and B 's share is:
1
1,000
2
800
3
900
4
850