Before we talk cars, prices or profit — let's work out what your shop costs to run. The number that has to be covered every single hour you're open.
Parts, sublet repairs, job consumables, merchant & EFTPOS fees, owner wages or drawings, and income tax. These aren't part of the cost of simply being open.
Each time you add or lose a team member, change wages, take on a new expense, move premises, buy equipment, or change how the business runs — come back and update this.
Once you know what it costs just to open the doors, you know the floor. From there we can work out the cars, the average repair order, and the revenue that takes you past surviving and into profit.