I added some custom attributes to my product such as `cost` and `markup`. By default markup will be set to 1.5 but the admin can adjust this.

When I am in the admin panel, I want to be able to *observe* a change on the `cost` field and have the `price` field populated automatically based on the formula:

    price = cost * markup

If anyone can point me in the right direction on where this code may need to be updated or provide any examples that would be awesome.