An economics professor at Prances University devotes 50 percent of her time to teaching, 35 percent of her time to research and writing, and 15 percent of her time to service activities such as committee work and student advising. The professor teaches two semesters per year. During each semester, she teaches one section of an introductory economics course (with a maximum enrollment of 50 students) and one section of a graduate economics course (with a maximum enrollment of 30 students). Including course preparation, classroom instruction, and appointments with students, each course requires an equal amount of time. The economics professor is paid \($135,000\) per year.

Required

Determine the activity cost of instruction per student in both the introductory and the graduate economics courses.