A book of 20 stamps would be worth US$3.80, or 13.78 pounds, or 6.23 kilograms.
assitant
20 stamps would buy a book of stamps.
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