Explanation:

- Let's denote B's monthly salary as x.

- A's salary is 20% more than B's, so A's salary is 1.2x.

- C's salary is Rs25,000 more than B's, so C's salary is x + 25,000.

- The total monthly salary for A, B, and C combined is Rs2,65,000.

So, the equation is:

\( x + 1.2x + (x + 25,000) = 2,65,000 \)

- Simplify the equation:

\( 3.2x + 25,000 = 2,65,000 \)

- Subtract Rs25,000 from both sides:

\( 3.2x = 2,40,000 \)

- Solve for x:

\( x = 75,000 \)

- Thus, B's salary is Rs75,000 and C's salary is \( 75,000 + 25,000 = 1,00,000 \).

- The percentage of B’s salary to C’s salary:

\( \frac{75,000}{1,00,000} \times 100 = 75\% \)

- Correct Answer: Option 1 - 75%