Definitely cents, with the emphasis on the s.
If you want to use it as an adjective, just always make it singular to render it as a modifier.
And if you want it is a noun, you don't have to change the form of the word/s you have intended to state.
You can click the link here for more information.
http://www.topix.com/forum/city/welch-wv/TSFBIHPPHBRQ8OLE3: CENTS, not "cent"