Problem 11-25 Effects of operating leverage on profitability
Cooper Training Services (CTS) 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 CTS incurs is instructor salaries; it pays instructors  $3,600 per course taught. CTS recently agreed to offer a course of  instruction to the employees of Akers Incorporated at a price of $340  per student. Akers estimated that 20 students would attend the course.
Base your answer on the preceding information.
Part 1:
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 20 percent increase in enrollment  (i.e., enrollment increases to 24 students). What is the percentage  change in profitability?
d. Determine the profit, assuming a 20 percent decrease in enrollment  (i.e., enrollment decreases to 16 students). What is the percentage  change in profitability?
e. Explain why a 20 percent shift in enrollment produces more than a 20  percent shift in profitability. Use the term that identifies this  phenomenon.
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