It will be somewhat particular to your client’s area of business, and other factors like the size of the business. The range could be very wide.
The extent of the services provided is also a factor. An independent consultant isn’t seen as bringing breadth with his services. He has no backup, no assistance, and no diversity of skills and knowledge to apply to his work. The independent will always say he has the experience and contacts to provide that, but he doesn’t look as valuable as a large firm with abundant resources.
There’s also the technical or management level of the work. Obviously, the higher the level of expertise, the greater the rate. Just describing something as ‘designing and implementing the business systems to allow them to enter the cloud’ doesn’t make it high level work. You have to consider how many people are involved in, and depending on the development. A manager of a team will charge more than someone who works indepently.
I don’t know if you are a buyer or a seller here either.
As a little factual information, but not much use without more detail, I know programmers in the Boston area who work for as little as $50 an hour as consultants (though that is very low), and a management consultant charging $2000 per diem. But I don’t think either of those numbers represents anything typical.