Agricultural Economics Department estimated that the number of students who cannot attend classes on specific months is as below; Courses Months Q. January February March April May Techniques 25 20 30 15 05 I. Trade 20 15 10 15 10 Econometrics Statistics 30 20 15 10 05 10 15 10 15 15 L Using the above information; (a) Determine the OPTIMAL schedule of the four classes. Which Month is free of any classes? (b) Assuming a new separate course "Microeconomics" is included as the fifth course for the class, it was also estimated that the following number of students cannot attend the course "Microeconomics" in the same said Months (Jan. to May); 15, 20, 15, 25 and 05. Determine the new OPTIMUM schedule for the five courses.