Derivative of Log Function

Hey guys,

I'm really having some difficulty understanding how to find the derivative of log functions - I keep trying these homework questions and getting most of them wrong and I'm really starting to get annoyed.

Here's a question, for example:

y=ln(4x)/x^4

y'=?

I did attempt it several times, different ways but each time it was wrong...

Any hints on how to go about these sorts of questions? I know that you're supposed to use the chain rule but it's just not working for me for some reason.

Any help's appreciated!