Answer:
$ 896,000.00
Step-by-step explanation:
September $800,000 
October $920,000 
November $840,000 
December $760,000
Payments for November: 
30percent purchase for November: = 30/100 x $ 840,000.00
 = $ 252,000.00
 70 percent payment for the previous month
 =70/100 x $ 920,000.00
 = 644,000.00
Total payments = $ 252,000 + $ 644,000.00
 =$ 896,000.00