Can you explain how to do this question I got it wrong and can't figure out why? The main issue is I can not figure out how you choose which months to calculate. how do you know to do 3 months of calculation ?

Galina, Inc. has prepared the following direct materials purchases budget: Month June July August September October Budgeted DM Purchases $68,000.00 80,000 77,800 73,900 69,200 All purchases are paid for as follows: 10% in the month of purchase, 50% in the following month, and 40% two months after purchase. Calculate the budgeted balance of accounts payable at the end of October. A. $91,840.00 B. $57,240.00 C. $62,280.00 D. $29,560.00