$1.$ Assume that a company has two cost drivers$$number of courses and number of students. The planned number of courses and students were $5$ and $100,$ respectively. The actual number of courses and students were $6$ and $110,$ respectively. One of the company$$s expenses is influenced by both cost drivers. Its cost formulas are $$49$ per course and $$5$ per student. The activity variance for this expense would be: $2.$ Assume that a company has two cost drivers$$number of graphing calculators and number of customers. The planned number of graphing calculators and customers were $5$ and $100,$ respectively. The actual number of graphing calculators and customers were $6$ and $110,$ respectively. One of the company$$s expenses is influenced by both cost drivers and it has a fixed element as well. Its cost formulas are $$50$ per graphing calculator, $$5$ per customer, and $$1,000$ per period. The total cost included in the flexible budget for this expense would be: $3.$ Assume that a company has two cost drivers$$number 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 company$$s expenses is influenced by both cost drivers and it has a fixed element as well. Its cost formulas are $$58$ per course, $$6$ per student, and $$1,000$ per period. The activity variance for this expense would be: