Correct Answer - Option 4 : Rs. 7200, Rs. 8100

**Given:**

The ratio of income of A and B = 8 : 9

Increment in A’s income = 1700

The decrement in B’s income = 100

New ratio of income of A and B = 9 : 8

**Formula used:**

Income = Expenditure + Saving

**Calculation:**

Let the income of A and B is Rs. 8x and 9x respectively.

Then, (17x + 1700)/(9x – 100) = 17/8

⇒ 136x + 13600 = 153x – 1700

⇒ 136x – 153x = 13600 + 1700

⇒ 17x = 15300

⇒ x = 900

A’s income = 8 × 900

⇒ 7200

B’s income = 9 × 900

⇒ 8100

**∴ The income of A and B is Rs. 7200 and Rs. 8100 respectively.**