You would be asking what goes into that hourly rate.
Turns out it cost $30 for flurodie and $60 for xrays. Fluoride is only covered in kids, and xrays every 2 years. I call up dentist office and you know what they tell me? They don't provide treatment based on insurance coverage.
Right...they provide treatment based on how much money they can rip you off on. Fluoride for adults is new. We have fluoride in the water and in the toothpaste.. I don't recall having it in the past and my Google search tells me where's a debate on whether it's even beneficial. I only see that it benefits the dentist's pockets.
The parent post expanded on that point by trying to list all the other charges for a common car service in the style that would be similar to what one would see if they were admitted to the hospital for an procedure. He then reiterated the point that the cost estimate only included the cost of parts (the 4 spark plugs).
I just expanded on that by listing the other labor related charges for the procedure that still wouldn't be included in the estimate.
In terms of car repair, you just have to know about the hourly rate of the shop and the number of hours they state a particular repair will take. In a hospital setting, you have no idea how many people will interact with you and what their charges will be (which appear to be unrelated to how much time they actually spent with your case).
Because every single one I've been to also includes labor cost in the estimate.
It costs $75 to pull the car into the garage, the lift fee is $105, it's $21 to open the hood, $64 to unplug the wires from the old plugs, $64 to plug the wires into the new plugs, then there's $18 to close the hood (gravity assist discount), and another $75 to put the car back in the parking lot.
Don't worry, changing your plugs is only $16.