Explanation:

To solve this problem, let's break it down:

- Initial Conditions:

- The girl spends 76% of her income.

- Therefore, initially, savings are 24% of her income.

- With Increased Income & Expenditure:

- Income increases by 18%. So, new income = 118% of the original income.

- Expenditure increases by 25%. New expenditure is 125% of the old expenditure.

- Original expenditure was 76% of the original income.

- New expenditure = 1.25 * 76% = 95% of the original income.

- Calculate New Savings:

- With the new income, savings = New income - New expenditure.

- New savings = 118% (of original income) - 95% (of original income) = 23% of the original income.

- Percentage Change in Savings:

- The initial savings were 24% of the original income.

- New savings are 23% of the original income.

- Percentage change = [(23 - 24) / 24] * 100 = -4.2%.

- Conclusion:

- The savings decreased by 4.2%.

Option 2: 4.2% decrease is correct.

.