MA[The Budgetary Process]

Hello Sir, I have some confusion about the budgetary process. The following details have been extracted from the receivables records of X: 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% Credit sales for June to September are budgeted as follows: June $35,000 July $40,000 August $60,000 September $45,000 Customers paying in the month after sale are entitled to deduct a 2% settlement discount. Invoices are issued on the last day of the month. The amount budgeted to be received in September from credit sales is: A. $46,260 B. $49,480 C. $50,200 D. $50,530 I don't understand why in the solution they are assigning Invoice paid in the month after sale 60% to August. I thought that the correct way would be giving 12% for the August sales because June July August is the third month. Solution: August Sales 60000*60%*0.98=35280 July sales 40000*25%=10 000 June sales 35000*12=4200 Answer 49480 Thank you in advance!