Between the corner damage and the bumper, a proper repair should be in the
$1500 range, if not more.  BTDT

Take it to a body shop of good repute to get a price.  Negotiate from there.
It's good to be a nice guy, but don't get screwed by being a nice guy.

Karl Wolz

Kim wrote:

Tell them it is going to cost $750. If they balk, talk to their
insurance company.

Sorry, but this is a common ploy to avoid paying. I've seen a number
of people get burned by this type of issue. Their insurance is to
cover YOU. Don't let their inability to pay cause you to get burned.