B invests 40% of his monthly salary on Travelling and 25% of remaining on Food. Again, he invested 20% of the remaining (after travelling and food expenses) on Rent. If he invested Rs. 7,200 on Rent and Food, then find his monthly salary.
Let monthly salary of B = 100x Amount invested on Travelling = (40/100) × 100x = 40x Remaining amount = 100x – 40x = 60x Amount invested on Food = (25/100) × 60x = 15x Remaining amount = 60x – 15x = 45x Amount invested on Rent = (20/100) × 45x = 9x ATQ, => (15x + 9x) = 7200 => x = 300 Therefore monthly salary of B = 100 × 300 = Rs. 30,000
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