That depends where you are posting it and how much it costs to post.
$1.35
It depends on where you live.
about $13
You can mail a one-oz. letter to Africa for 94 cents.
61 cents
.45 + .20 = .65
That depends on where you are mailing it from.
Postage is 98 cents for an 1-oz. letter.
$1.10
Try here: http://www.wikisummaries.org/The_World_Is_Flat
To mail a letter from Raleigh NC to Vatican City Rome you will need international postage. The amount it will cost to mail the letter will be $1.10. This is for a regular business sized envelope.
4.2 oz