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In the first week of​ July, a record
1,020 people went to the local swimming pool. In the second​ week,
100 fewer people went to the pool than in the first week. In the third​ week,
130 more people went to the pool than in the second week. In the fourth​ week,
234 fewer people went to the pool than in the third week. What is the percent decrease in the number of people who went to the pool over these four​ weeks?

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