NO.PZ2018111303000077
问题如下：
If PZ reported an unusually sharp decline in accounts receivable in the current year, and an increase in long-term trade receivables. Compared with the previous years，what will be the impact on PZ financial ratio in the current year:
选项：
A.days sales outstanding will decrease.
B.days sales outstanding will increase.
C.days sales outstanding will unchanged.
解释：
A is correct.
考点: DSO
解析:
Because accounts receivable will be lower than reported in the past, PZ’s DSO [Accounts receivable/(Revenues/365)] will decrease.
当年的AR减少，AR turnover增加，DSO降低，选A。
DSO也叫应收账款周转天数，含义就是别人欠的大概欠多久能还。
定义式如下：Days of sales outstanding (DSO) =365 / receivables turnover
其中，Receivables turnover = annual revenue / AR题干说了 AR 减少，只考虑短期的AR，不考虑题干中增加的混淆项 long-term trade receivables，所以 DSO 减少。题干哪里说到了短期，这个公式默认得用短期？请把知识点体现短期的框架图发我看看
