At the swim meet, Carly scored 6.8, 7.1, and 8.1 on her three dives. If 10.0 is the highest she can score and all the dives are weighted equally, what is the minimum that she needs to score on her fourth dive for an average score of 8.0?

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At the swim meet, Carly scored 6.8, 7.1, and 8.1 on her three dives. If 10.0 is the highest she can score and all the dives are weighted equally, what is the minimum that she needs to score on her fourth dive for an average score of 8.0?