Answer:
1,073.54 total interest
Explanation:
39,000 x 9% x 80days/360 = 780 interest expense
Payment 4,200 - 780 = 3,420 deducted form the note:
39,000 - 3,420 = 35,580
35,580 x 9% x 33/360 = 293.54 interest expense
6,200 - 293.54 = 5,906.47 deduced form the note
35,580 - 5,906.47 = 29,673,53
293.54 interest expense
780 interest expense
1,073.54 total interest