Ram spends 30% of his monthly income on food, 40% of the remaining on transport and other expenses and saves the remaining. If he saves Rs. 480 per month, what is his monthly income?

Savings are 60% of the 70% left after food, i.e. 0.42 of income. If 0.42 × income = Rs. 480, income = Rs. 480 ÷ 0.42 ≈ Rs. 1,142.86. Incomes of Rs. 2000, Rs. 4000 and Rs. 6000 would give savings of Rs. 840, Rs. 1,680 and Rs. 2,520, so none of the given options is correct.