How much is a first class stamp?
user
There are multiple answers to that question!  The rate for domestic mail in the United States is 49 cents (USD) per one ounce.
assistant
How much is a book of 20 stamps?
user
A book of 20 stamps would be worth US$3.80, or 13.78 pounds, or 6.23 kilograms.
assistant
How much is a first class stamp?
user
There are multiple answers to that question!  The rate for domestic mail in the United States is 49 cents (USD) per one ounce.
assistant
How much is a book of 20 stamps?
user
20 stamps would buy a book of stamps.
assistant
How much is a first class stamp?