Depends on the guy, but usually its by dent or by panel.

I've seen $50 per dent, $75 per panel in my area. Check with your local dealership for their recommendation, they most likely sub out the work to Dent Wizard or similar.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards