Because all mail destined for APO/FPO addresses is sent priority (or should be, to almost guarantee delivery) it would depend on size + weight of the mail being sent. You can ship to APO/FPO via regular USPS mail, but again, it depends on your size and weight of the item being sent. If it's just a letter, you should be okay with just a regular stamp of the current stamp price.
21p
44 cents
96 cents.
See: USPO website.
Florida is in the US...
$1
Postage to Europe from the US is 98 cents for a one-ounce letter.
how much postage does it take to mail a W2 envelope
Do you mean Colombia? If so, the answer is $0.98.
99 cents in a standard envelope.
96 cents
It's 94 cents.