I saw the image. The large box is filled with 6 columns of staples which has 5 box of staple each.
6colums * 5boxes/column = 30 boxes of staples.
30 boxes * 120 cu cm/box= 3,600 cu cm.
The estimated volume of the large box is 3,600 cu cm.
$65.91 should be the account balance at the end of the month