You and your classmates create 21 sculptures to sell at the PTA auction to raise money for your school. In order to pay for the materials you bought to make the sculptures, you need to sell each of the sculptures for $6.00. When transporting the sculptures to the auction, one of your parents accidentally drops three of the sculptures in the street and they are run over by a Community Transit bus. What is the new minimum price you need to set for the remaining sculptures in order to pay for the materials?

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