雄樂旅行社推出暑期環島優惠方案：五天四夜環島旅遊，原價每人 10800元，優惠期間每人僅收 4800 元，若該團達到 20 人後，則每增加 1 人，每人少收 200 元。按照此優惠方案，該旅行

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31. 雄樂旅行社推出暑期環島優惠方案：五天四夜環島旅遊，原價每人 10800元，優惠期間每人僅收 4800 元，若該團達到 20 人後，則每增加 1 人，每人少收 200 元。按照此優惠方案，該旅行社每團多少人時，會有最大的收入?
(A) 18 人
(B) 20 人
(C) 21 人
(D) 22 人

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