using simplex method, in excel $,$ solve for this The Continuing Education Division at the Ozark Community College offers 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 and per course, respectively. $($a$)$ Devise an optimal course offering for the college. $($b$)$ Show that the worth per additional course is $,$ which is the same as the revenue per practical course. What does this result mean in terms of offering additional courses?