How much will it cost to get an extra electrical socket installed in my room by an electrician?

I am planning on getting an extra electrical socket installed in my room, because there currently is only one. How much would this usually cost for an electrician to install it? What is the process of doing so? Thanks! To add, there is no basement below, but there is a closet right next to the wall I want it installed in. As I said, I am having an electrician do it.