Explanation:

- A man allocates his sum of money among his wife, son, and daughter.

- Wife receives 45% of the total sum.

- Son receives 30% of this sum.

- Daughter gets a fixed Rs6,25,000.

- This means 100% - 45% - 30% = 25% = Rs6,25,000 goes to the daughter.

- Calculate total sum: Rs6,25,000 / 25% = Rs25,00,000.

- Wife's share: 45% of Rs25,00,000 = Rs11,25,000.

- Option 1: Rs5,00,000 – Incorrect.

- Option 2: Rs11,25,000 – Correct Answer.

- Option 3: Rs7,50,000 – Incorrect.

- Option 4: Rs6,25,000 – Incorrect.