The ratio of the incomes of A and B is 3 : 4. The ratio of their expenditure is 7 : 10. If A and B save ₹2,500 and ₹3,000, respectively, then what is the ratio of the income of B to the combined expenditure of A and B?
1
17 : 18
2
16 : 17
3
11 : 13
4
5 : 7