Explanation:

- Work Rate of Samir: Completes the work in 10 days, so he does 1/10 of the work per day.

- Work Rate of Puneet: Completes the work in 15 days, so he does 1/15 of the work per day.

- Combined Work Rate of Samir and Puneet: For 3 days, (1/10 + 1/15) of work per day which equals 1/6 of the work per day. In 3 days, they would complete 1/2 of the work.

- Remaining Work: 1/2 of the work is left.

- Ashok's Contribution: All three complete the remaining 1/2 of the work in 2 more days.

- Combined Work Rate of All Three: They complete 1/4 of the work per day (since half the work was done in 2 days).

- Ashok's Rate Contribution: He contributed 1/4 - 1/6 (combined rate of Samir and Puneet) = 1/12 of the work per day.

- Total Work Done by Ashok: Over 2 days, Ashok did 2*(1/12) = 1/6 of the work.

- Payment to Ashok: Ashok did 1/6 of the total work, so he gets 1/6 of Rs 4500.

Answer:

- Payment to Ashok: Rs 750

- Correct Answer: Option 3 - Rs 750