Average monthly income of a family of 4 earning members = Rs. 6,250 ⇒ Total monthly income of a family of 4 earning members = 6250 × 4 = Rs. 25, 000 Similarly, total monthly income of a family of 3 earning members = 6500 × 3 = Rs. 19, 500 ∴ The monthly income (in rupees) of the deceased = 25, 000 − 19, 500 = Rs. 5, 500