Perez Training Services (PTS) provides instruction on the use of computer software for the employees of its corporate clients. It offers courses in the clients' offices on the clients' equipment. The only major expense PTS incurs is instructor salaries; it pays instructors $5,100 per course taught. PTS recently agreed to offer a course of instruction to the employees of Novak incorporated at a price of $500 per student. Novak estimated that 20 students would attend the course. Base your answers on the preceding information. Problem 2-21A (Algo) Part 2 The instructor has offered to teach the course for a percentage of tuition fees. Specifically, she wants $300 per person attending the class. Assume that the tuition fee remains at $500 per student. f. Is the cost of instruction a fixed or a variable cost? 9. Determine the profit, assuming that 20 students take the course. h. Determine the profit, assuming a 10 percent increase in enrollment (le, enrollment increases to 22 students) What is the percentage change in profitability? 1. Determine the profit, assuming a 10 percent decrease in enroliment (.e., encoliment decreases to ts students). What is the percentage change in profitability