If it's a standard size envelope and weighs 30g or less, it costs $1.05. How many stamps that is depends on the value of the stamps.
If it's bigger or heavier, it will cost more.
A standard letter gets one first class stamp. First class mail takes 3-5 days for delivery.
One 75 cent stamp
About 10 stamps
It depends entirely on the value of the stamps. In 2010, a standard letter currently requires a stamp or stamps to the value of 60c within Australia.
Only one
The number of stamps that you need to send a letter from Australia to London, will depend with the value of one stamp.
one
3 stamps.
One first class postage.
10
1. it's the same for all of the US
98 cents worth
One stamp will cover one ounce of first class mail to anywhere in the USA.
A single 45 cent First Class stamp did the job after 22 January 2012.
You should probably go to your Postal Office, because it depends on the letter weight, what is in it, and how fast you want it to be shipped.