F2Budgeting的问题，请教各位高手... details, collection, second, records

iris-mao

 The folloing details have been extracted from the receivables collection records of C Co.
 
 Invoices paid in the month after sale                                    60%
 Invoices paid in the second month after sale                         25%
 Invoices paid in the third month after sale                             12%
 Bad debts                                                                           3%
 
 Invoices are issued on the last day of each month.
 
 Customers paying in the month after sale are entitled to deduct a 2% settlement discount.

 Credit sales values for June to September are budgeted as follows.
           June          $35,000
           July           $40,000
           August      $60,000
           September $45,000

Question: The amount budgeted to be received from credit sales in September is?

     A.  $46,260
     B.  $49,480
     C.  $50,200
     D.  $50,530


根据解答，The month指的是August, The second month指的是July，The third month指的是June. 为什么呢？