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ATQ, Let the initial monthly income of Anita be Rs. '100r'. Monthly expenditure of Anita = 75% of 100r = (0.75) × 100r = Rs. '75r' Monthly savings of Anita = 100r - 75r = Rs. '25r' New monthly income of Anita = 116% of 100r = (1.16) × 100r = Rs. '116r' New monthly expenditure of Anita = 111% of 75r = (1.11) × 75r = Rs. '83.25r' New monthly savings of Anita = 116r - 83.25r = Rs. '32.75r' Increase in monthly savings = 32.75r - 25r = Rs. '7.75r' Required percentage = (7.75r/25r) × 100 ~ 31%
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