how much does the book cost?
"How much does breakfast cost?"
¿Cuanto cuesta el vestido?
Translation: How much does "Font Vella" water cost?
'Lo menos posible', pide el arrendatario. 'Lo mas posible', responde el dueño.
Un toster cuesta dondequiera entre 10 a 150 dólares dependiendo de qué clase usted está buscando
How much action is in Peru or in South America?
Actualmente (el 13 de junio 2012) €1 = $1.2596
Translation: Cuanto cuesta para que El Trono de Mexico venga a una quinceanera?
el libro
Since you are lacking punctuation, it is a little hard. "Sí, tengo el libro" would mean 'yes, I have the book' "Si tengo el libro" would mean 'If I have the book...." Not only that, but "la libro" needs to be "el libro" because Libro is a masculine noun.
it means book
El libro de mi amigo is "my friend's book" in English.