### Solution:

Concept: Suppose the amount of rice sold with a loss of is x kg, the question asks you to find this, so the remaining amount of rice is Kg sold with a profit of .The amount of rice sold with a 20% loss is x kg

And the cost is Since the loss is , the gain is at , so it is , and the total loss is , so it is.

Amount used for selling x kg =Amount used for selling = Now, the question states that the total loss of 600 kg of rice is . Therefore, the total amount a trader receives after losing The question states that the merchant will sell the amount of rice that is a loss of 20% and the amount of rice that is a profit of 15%, so adding formulas (1) and (2) will give: It looks like.

From equation (4) and (3) we get:

On further solving equation (5) we get:

Hence, the correct answer is option (2)