Let the monthly income be x. Rent = 0.4x, Groceries = 0.2x, Utilities = 0.15x. Total expenses = 0.4x + 0.2x + 0.15x = 0.75x. Savings = Income - Expenses = x - 0.75x = 0.25x. Given savings = ₹5,400. 0.25x = 5400 → x = 5400 / 0.25 = ₹21,600. Correct answer: C) ₹21,600
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