Answer:
1st box: 385 in squared x .03 = $11.55 per box.
$11.55 x 50 boxes = $577.50
2nd box: 439.75 in squared x .03 = $13.1925
$13.1925 x 50 boxes = about $659.63
The company would save $659.63 - $577.50= $82.13 per 50 boxes if they go with the smaller box.
Hope this helps :)