It only takes a single stamp. But it does have to be the correct denomination. Currently the rate for one ounce from the US to Afghanistan is 98 cents. Note, if you are sending mail to a servicemember through their APO or FPO box, the normal First Class rate of 44 cents applies.
what the price to mail letter to
3 stamps!
About one liberty stamp :)
you need ten stamps actually i don't know
maybe 2 0r 3 stamps
3 stamps.
The number of stamps that you need to send a letter from Australia to London, will depend with the value of one stamp.
2
$1.10 worth of stamps, this may change.
one
40
1