Assume that a company has two cost driversnumber of courses and number of students. The planned number of courses and students were 5 and 100, respectively. The actual number of courses and students were 6 and 110, respectively. One of the companys expenses is influenced by both cost drivers. Its cost formulas are $50 per course and $4 per student. The total cost included in the flexible budget for this expense would be: A. $840. B. $740. C. $540. D. $640.