This is a difficult one to answer, as rates will vary significantly depending on the location, how well equipped the garage is, and whether the garage is a manufacturer franchise or independent.
Rates at franchised garages which trade in association with a major car brand will tend to be higher, but this comes with the guarantee that the mechanic will have the specific training and equipment for your particular vehicle. However, you definitely shouldn’t rule out independent garages, as many of them work to the same standards, have mechanics with the exact same qualifications, and have access to the same technical equipment and information as franchised operations.
The best way to be sure you’re getting a good deal is to speak to a few different garages and compare their rates and their facilities.
Before you choose any particular garage, it’s a good idea to take a look around first to get an idea of how well it’s run - if it’s clean and tidy, that’s a good sign. Ask friends and family for a recommendation too.
Finally, always try to speak to a mechanic rather than a sales person - they will be able to tell you what your car needs, rather than trying to sell you additional services.