$20.00
You need only one notarization per document, even if your document has several pages. E.g., if you have 1 birth certificate and 1 death certificate, you will need 2 notarizations. If you have 1 birth certificate with 2 pages, you will need only 1 notarization.
In most cases, notarization by a notary public is only necessary for documents to be presented in court. When in doubt, please ask the requesting authority.