CTA

Tiny PR to add a primary cta to the car cost calculator on the car campaign page. Do we have a rails friendly url for the car cost tool?
The benefit of using `link_to` is that it is a helper provided by Rails designed exactly for the purpose you require. `content_tag` is more generic. If we can be more specific, why not?

I'm not sure lines of code matters here, what is more important is how expressive the code is. If I read `content_tag(:a ...)` I have to think "we're creating an anchor tag". If I read `link_to` then I don't have to, the code is expressive.

In regards to the helper - is it beneficial to hide away the markup?