3.1 Plot demand curve
This exercise is based on Section 3.1 of OpenStax Principles of Economics (2e). The student should plot the points from the table in the textbook: {(420, 2.2), (460, 2), (500, 1.8), (550, 1.6), (600, 1.4), (700, 1.2), (800, 1)}.