First Maintenance for my car

[Prius 2014 plug-in hybrid?]

It was my mom's car and I got it for college. Very sick car, saves me so much on gas, I love my Prius. However, I realized that the cover for the front underneath (idk what it's called) was falling off. Went to the shop and they told me it $400 for the repair + $200 for oil change and brake pad replacement. The oil change and brake pad seem alright, but I was wondering if it was standard for that repair to be so high? Too late now because I'm picking it up later today, but I just wanted to know for sure.

 

Will note that next time. It's actually the first time I ever got a repair. I didn't know what I could and couldn't ask for. He did order new parts and replaced it so it's not like he zip tied it for me and charged for the parts, and he did also say that it was mostly the parts the were expensive. Guess that's just bad rng

Not sure but she's definitely been used. And the bottom has always been an issue because my drive way is unevenly sloped, and quite steep, so parking it after a drive always scratches the bottom a little.