The Continuing Education Division at the Ozark Community College offer a total of 30 courses each semester. The courses offered are usually of two types: practical and humanistic. To satisfy the demands of the community, at least 10 courses of each type must be offered each semester. The division estimates that the revenues of offering practical and humanistic courses are approximately $1500 and $1000 per course, respectively.
Show that the dual price of an additional course is $1500, which is the same as the revenue per practical course. What does this result mean in terms of offering additional courses?