Explanation:

- The marked price is Rs. 600.

- The marked price is 50% above the cost price.

- Therefore, let the cost price be \( x \).

- \( x + 0.5x = 600 \) \(\Rightarrow\) \(1.5x = 600\) \(\Rightarrow\) \(x = 400\).

- The cost price is Rs. 400.

- The profit is 30% on the cost price.

- Selling price = Cost price + Profit.

- Profit = 30% of 400 = 0.3 \(\times\) 400 = Rs. 120.

- Therefore, selling price = 400 + 120 = Rs. 520.

None of the given options match the selling price of Rs. 520.

- Correct Answer: Option 5 - None of these.