babybearmm

顶楼主，我也有疑问，不知道是不是题目出错了.....
根据notes，如果我没理解错的话，"number of days receivable" = "average collection period" 即这俩是同一个概念，所以我不理解为啥题目里会一个数值增加、另一个数值降低

references:

2012 Schweser Notes    Book #4     Page 91
"The inverse of the receivables turnover multiplied by 365 is the number of days of receivable (also called the average collection period or average days' sales outstanding), which is the average number of days it takes for the company's customers to pay their bills:"

babybearmm

啊我明白这道题了！！

关键是：
1. "number of days receivable" = "average collection period" = 365 / receivable turnover
2. "WEIGHTED average collection period" (WACP)

这两个概念完全不同！
我之前引起混淆，是因为一个叫做 "average collection period" , 另一个叫做"WEIGHTED average collection period". 名字里多一个weight这单词，但是——不是average x和weighted average x这样简单的的数学关系（我想说，并不是简单的算术平均和加权平均的关系），而是完全不同的概念！


"number of days receivable" 的定义那个式子，只涉及sales和account receivable的量(in dollars)，体现的含义就是：我账面上这么多receivables，相当于我多少天的sales呢？
换句话说，涉及的比例是：account receivable  (即credit sales，而非当即pay cash）占总sales的比例。题目里说这个数值从去年52降低到今年48，那就说明今年credit sales占总sales的比例减少，所以A和C都说错了。(正如书上解释的"Blodnick has less credit sales outstanding since days of receivables are down, so credit
sales are a smaller part of Blodnick's business. Relaxed credit standards would tend to
increase average days of receivables.")

而WACP体现的是the time it takes to collect receivables. 根据题意，尽管今年credit sales占总sales比例减小，但那些purchase by credit的消费者拖时间迟迟不付款，所以我预期收到付款所需要等待的时间变长。这就是WACP体现的意义，就是选项B说的。(这里Notes说：“Outstanding accounts are paying more slowly since the average collection period is up.”  我觉得Notes应该是印错了，average collection period前面应该有个weighted，也就是说这句话讲的是WACP.)
目前想法如上，如果不对的话欢迎指点，谢谢。