This video shows how to think about calculating consumer surplus when demand is perfectly inelastic. The problem is taken from Economics, 4th Edition, by R. Glenn Hubbard and Anthony Patrick O’Brien, and is Ch. 4 problem #1.7. (The problem number stated in the video is incorrect.)
You can find more practice problems via the Practice Problem of the Day category archive or by visiting the Econ Classroom page. You can also be notified of new practice problems by subscribing to the YouTube channel.