Required information [The following information applies to the questions displayed below.] Thornton Training Services (TST) 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 TST Incurs is instructor salaries; it pays instructors $5,700 per course taught. TST recently agreed to offer a course of instruction to the employees of Novak Incorporated at a price of $460 per student. Novak estimated that 20 students would attend the course. Base your answers on the preceding information. The instructor has offered to teach the course for a percentage of tuition fees. Specifically, she wants $240 per person attending the class. Assume that the tuition fee remains at $460 per student. f. Is the cost of instruction a fixed or a variable cost? g. Determine the profit, assuming that 20 students take the course. h. Determine the profit, assuming a 10 percent increase in enrollment (ie, enrollment increases to 22 students). What is the percentage change in profitability?