Final answer:
The activity cost of instruction per student in the introductory economics course is $1,650 and in the graduate economics course is $2,750.
Step-by-step explanation:
To determine the activity cost of instruction per student, we first need to calculate the total cost of instruction for each course. The economics professor devotes 50% of her time to teaching, so we can allocate 50% of her salary to teaching activities. Thus, the activity cost of instruction for the introductory economics course is $82,500 (50% of $165,000) and for the graduate economics course is also $82,500.
Next, we need to divide the activity cost of instruction by the maximum enrollment of each course to find the cost per student. For the introductory economics course, the cost per student is $1,650 ($82,500/50) and for the graduate economics course, the cost per student is $2,750 ($82,500/30).