The answer will depend on where from and where to. And since you have not bothered to share those crucial bits of information, I cannot provide a more useful answer.
how much a first letter that weighs 2.1 oz cost to mail
about $13
.45 + .20 = .65
61 cents
61 cents
, Could you please tell me how much postage I would need to mail a large envelope weighing 4.3 OZ to the UK?
Try here: http://www.wikisummaries.org/The_World_Is_Flat
$1.10
For what? To mail? To insure? To overnight? Please be more specific!
it could cost anywhere from $4.95 to $60.00
4.2 oz
$16.25.