Cost to Replace Toilet Fill Valve & Supply Line: Is $365 accurate costs from my PM?

[Cory M.]

I just got billed $365 by my property manager for replacing a toilet fill valve and supply line. That seems a bit high to me, but I figured I should check before I get too upset about it. Does anyone local to Memphis know what the going rate for simple repairs like that should be? 

Checking Home Depot, it looks like parts would be $30 or less. That leaves $335 for labor and the property manager's fees. Is it reasonable for me to ask the property manager for a breakdown of parts/labor costs?