99 cents in a standard envelope.
21p
Postage to Europe from the US is 98 cents for a one-ounce letter.
This depends on where you are mailing the letter from, and the dimensions and weight of the letter.
44 cents
96 cents.
See: USPO website.
The postage rate for a standard item of mail within Australia is $0.70 AUD at January 2014.
Florida is in the US...
$1
The cost of mailing a standard letter within Australia in 1958 was 4d (four pence). it was very shortly to sky rocket way up to 5d (five pence) the following year.
For a first class letter of one ounce to another US destination, it takes 44 cents of postage.
96 cents