Explanation:

- The coins are in the ratio of 2:3:5. Let the common multiple be x.

- Then, coins of 50 p = 2x, coins of 25 p = 3x, and coins of 20 p = 5x.

- The amount from 50 p coins is = 0.50 × 2x = Rs x.

- The amount from 20 p coins is = 0.20 × 5x = Rs x.

- The total amount is Rs 550, so, x (2x*0.50 + 3x*0.25 + 5x*0.20) = 550.

- After solving: x = 100.

- So, amounts from 50 p coins = Rs 100, from 20 p coins = Rs 100.

- The difference = Rs 100 - Rs 100 = Rs 0.

Correct Answer: Option 4 - Rs 0.