3. A single facility is needed to meet the demands of four markets. The locations and demands of these four markets are shown below. Market A B D Coordinates (8,6) (4, 12) (3, 2) (9,6) Demand 10 15 10 6 a) Use the information from Table above. What are the x and y coordinates for the center of gravity? b) If the facility is located at the center of gravity, what is the load-distance score, assuming rectilinear distance