How much does it cost for a copy?

20 or 25 cents

20 cents

Twenty cents

From library website: Regular printing prices apply. The Library offers both black-and-white or color printing and photocopying. Charges are as follows: Black-and-white - 20 cents per page (10 cents per page at South Mountain Community Library) Color - 40 cents per page (50 cents per page at South Mountain Community Library) Print or copy jobs may be paid with one-dollar and five-dollar bills as well as coins. Prices vary due to contractual agreements with the leasing agencies involved. Library staff will assist you with printing or copying.

I'm familiar with the library and the librarians, and I'm of the opinion that if you're not asking for a book to be copied; you could probably just ask them to copy a couple things for you, and they would probably do it for nothing. Of course that's off the record.