Taxi to Granada Airport

Would anyone know what is the normal fare for a taxi from Granada Railroad Station to the airport?
Just over two weeks ago I was desperately trying to get to the Granada Airport and no taxis would stop. Then a man working with the local tourism offered to take me there on his motorcycle. He charged me 20 euros. The agent I purchased our tickets from at the airport said that is usually about 25 one way but was not sure. If she is correct then it seems like I got a bargain.

If you look up the airports homepage: (deep link) http://www.aena.es/csee/Satellite?cid=1047397546335&pagename=subHome&Language=EN_GB&SMO=1&SiteName=GRX&p=1047397546300&c=Page&MO=1
it says 17€ - so add the tip - and you end up that the guy was not only helpfull but even did not take more than you would have paid in any case.

Bjoern,

Well I do not get on here very often so would have replied sooner. Anyhow thank you for responding to my question, and like you said it looks like I was not cheated at all.