问题如下：
Mabel Corporation (MC) reported accounts receivable of $66 million at the end of its second fiscal quarter. MC had revenues of $72 million for its third fiscal quarter and reported accounts receivable of $55 million at the end of its third fiscal quarter. Based on this information, the amount of cash MC collected from customers during the third fiscal quarter is:
选项：
A.$61 million.
B.$72 million.
C.$83 million.
解释：
C is correct.
The amount of cash collected from customers during the quarter is equal to beginning accounts receivable plus revenues minus ending accounts receivable: $66 million + $72 million – $55 million = $83 million. A reduction in accounts receivable indicates that cash collected during the quarter was greater than revenue on an accrual basis.
这里的 revenue 又不等于 net income，为啥可以直接拿来减 delta AR 呢？
