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终于找到一个讲的比较明白的文章,不过他那个例子中,1%是不是应用错了,不应该应用在2000的expense上,应该应用在10万的revenue上?【略过前面,从For real estate agents这里开始才是例子】

It was holiday season and it’s always great time to get together with friends & families. We had four straight days of partying and now we are back to work. For our kids, this is the best time of the...
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