A man spends 12\% of his monthly salary on education and 7\% on rent. He invests Rs. 10,250 in a SIP and saves $4x\%$ of his salary. If his total monthly salary is Rs. 25,000, find the value of $x$.

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**Solution:**

1. Given:
   - Monthly salary = Rs. 25,000
   - Education expense = 12\% of salary
   - Rent expense = 7\% of salary
   - SIP investment = Rs. 10,250
   - Savings = $4x\%$ of salary

2. Calculate fixed expenses:
   - Education = $0.12 * 25000 = 3000$
   - Rent = $0.07 * 25000 = 1750$
   - SIP = Rs. 10,250

3. Total expenses excluding savings:
   $$3000 + 1750 + 10250 = 15000$$

4. Remaining amount for savings:
   $$25000 - 15000 = 10000$$

5. Set up the equation for savings:
 (4x/100) * 25000 = 10000
   \]

6. Simplify:
   $$
   1000x = 10000
   $$

7. Solve for $x$:
   $$
   x = 10000/1000} = 10
   $$

**Answer:** $10$

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