There are 20 students in a class, plus the instructor. Let's say that we would want to order x number of subs (and soda). If we order three large subs at $10 each and three bottles of soda at $2 each, would these TOTAL costs be considered fixed or variable? Then, would the cost per student be fixed or variable? What if only 18 students and the instructor are interested in sharing in the costs? Would this change our dollar amounts (assuming that we are still ordering the same # of subs and soda)? Any thoughts on how the relevant range may apply to this example?