How much is it to fix back right passenger.

We don't know if parts have to be fixed, replaced, bolted on, welded on, the going labor rates in your area, or the extent of the damage. What quality paint to you want? Different color paints cost different amounts. How much paint is needed? Do you want a higher-quality paint job than what it came with originally? That requires more layers of sealers and primers. You need to visit any body shop for an estimate. That's part of what they do.