In this question, we are given the ratio of the monthly incomes of A and B as 7:10, and the ratio of their expenditures as 2:3. We are also told that both A and B save 1,000 per month.

Let`s assume the monthly income of A to be 7x and the monthly income of B to be 10x, where x is a common factor.

According to the given information, the ratio of their expenditures is 2:3. This means that A spends 2x and B spends 3x.

We know that both A and B save 1,000 per month. Therefore, the equation can be formed as follows:

7x - 2x = 1,000 (A`s monthly income minus expenditure)

10x - 3x = 1,000 (B`s monthly income minus expenditure)

Simplifying the equations, we get:

5x = 1,000

7x = 1,000

Solving for x, we get:

x = 200

To find the monthly income of B, we substitute the value of x in the equation:

Monthly income of B = 10x = 10 * 200 = 2,000