Burnham Elementary School spent $100,000 on textbooks for the fall 2019 semester. It had expected to have a total enrollment of 450 students who would each have needed four books at a cost of $65...

Burnham Elementary School spent $100,000 on textbooks for the fall 2019 semester. It had expected to have a total enrollment of 450 students who would each have needed four books at a cost of $65 each. What is the textbook expense variance? Is it favorable or unfavorable? Why?