The main idea of the Audio in Spanish, taking into account the sentence in Spanish and the meaning of the content is: the fish is more expensive.
Audio Summary
The main character of the audio is Ana, a person who is in a port city, who ate in a restaurant whose specialty is seafood, in which she ate shellfish and fish, and now she must pay the bill.
The text says that shellfish costs $20 and fish costs $6 more than shellfish, so fish costs $26, therefore fish is identified as being more expensive.
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