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The actual price What is the proportion of edible meat in whole live mussels?

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The actual price of mussels

The price of one kilo of mussels (blue mussels) here in my town is around 60–70 SEK (9–11 USD). I think that makes a large enough portion for two people, but when checking if all of them are alive and when cleaning them, the price runs higher. I'm interested in what the price per kilo of the edible part (the muscle) of the mussels are. In one mussel, how much by weight is shell and how much is muscle?