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 Required a. Relative to the number of students in a single course is the cost of instruction a fixed or a variable cost? b. Determine the profit, assuming that 20 students attend the course c. Determine the profit, assuming a 10 percent increase in enrollmente, enrollment increases to 22 students). What is the percentage change in profitability? d. Determine the profit, assuming a 10 percent decrease in enrollmente enrollment decreases to 18 students) What is the percentage change in profitability? Required A Required B Required C Required D Relative to the number of students in a single course, is the cost of instruction a fixed or a variable cost? The cost of instruction is a Required A Required B Required C Required D Determine the profit, assuming that 20 students attend the course. Profit Required A Required B Required C Required D Determine the profit, assuming a 10 percent increase in enrollment (.e., enrollment increases to 22 students). What is the percentage change in profitability? (Round your percentage answer to 2 decimal places. Negative amount should be indicated with a minus sign.) Profit Change in profitability Determine the profit, assuming a 10 percent decrease in enrollment (i.e., enrollment decreases to 18 students). What is the percentage change in profitability? (Round your percentage answer to 2 decimal places. Negative amount should be indicated with a minus sign........ Profit Change in profitability