单选题:小军帮哥哥卖报纸,如果哥哥单独卖,7个半小时可以卖完,小军单独卖,12小时可以卖完,现在两人一起卖,工作效率提高了20%

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题目内容:
小军帮哥哥卖报纸,如果哥哥单独卖,7个半小时可以卖完,小军单独卖,12小时可以卖完,现在两人一起卖,工作效率提高了20%。当卖掉78%时,突然开始下雨,使得每小时少卖51份,结果共用了4个半小时将报纸全部卖完。那么二人一共卖了多少份报纸?( )
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