A man spends 12% of his monthly salary on education and 7% on rent. He invests Rs. 10250 of his salary in a SIP and saves 4x% of his salary. If his total monthly salary is Rs. 25000, then find the value of x?

To find the value of $x$, we need to account for all parts of the man's monthly salary.

Given data:
- Total monthly salary = Rs. 25000
- Spend on education = 12% of salary
- Spend on rent = 7% of salary
- Investment in SIP = Rs. 10250
- Savings = 4x% of salary

Let's first express the SIP investment as a percentage of the total monthly salary:
$\text{SIP percentage}=\frac{10250}{25000}\times 100$
$\text{SIP percentage}=\frac{1025}{25}=41\%$

The sum of all allocations (education, rent, SIP investment, and savings) must equal 100% of the total monthly salary:
$12\%+7\%+41\%+4x\%=100\%$

Combine the known percentages:
$60+4x=100$

Subtract 60 from both sides:
$4x=40$

Divide by 4:
$x=10$

Therefore, the value of $x$ is 10.