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If benito is selecting samples of five values from the table, which row will result in the greatest mean? row 1 row 2 row 3 row 4

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Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?