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ATQ, Let monthly expenditure of ‘Ankita’ and ‘Mamta’ is Rs. ‘9a’ and Rs. ‘5a’ respectively. And, monthly savings of ‘Ankita’ and ‘Mamta’ is Rs. ‘7b’ and Rs. ‘4b’ respectively. So, 9a + 7b = 21300......................(1) And, 5a + 4b = 12000......................(2) Solving equation (1) and (2), we get; a = 1200 and b = 1500 Monthly expenditure of ‘Ankita’ = 9 × 1200 = Rs. 10800 Monthly savings of ‘Mamta’ = 4 × 1500 = Rs. 6000 Required percentage = [(10800 – 6000)/6000] × 100 = 80%
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