Explanation:

- Let income of A = 5x, income of B = 3x

- Let expenditure of A = 9y, expenditure of B = 5y

- Savings of A: 5x - 9y = 1300

- Savings of B: 3x - 5y = 900

- Solve the equations:

- (Multiply savings equations appropriately)

- 5x - 9y = 1300

- 3x - 5y = 900

- Multiply 2nd equation by 1.8: 5.4x - 9y = 1620

- Subtract 1st equation: (5.4x - 9y) - (5x - 9y) = 1620 - 1300

- 0.4x = 320 ? x = 800

- Incomes: A = 5x = 4000, B = 3x = 2400 (monthly)

- Yearly difference = (4000-2400) × 12 = 1600 × 12 = 19200

Correct Answer:

Option 4: Rs. 19200

- All statements are stepwise solution to derive incomes, then their difference yearly.

- Option 1, 2, 3, 5 are incorrect as calculated difference matches only option 4.