At 3 cents a page, his tests would cost more than $500 a year. His copying budget: $316. But he wanted to give students enough practice for the big tests they’ll face in the spring, such as the Advanced Placement exam.

“Tough times call for tough actions,” he says. So he started selling ads on his test papers: $10 for a quiz, $20 for a chapter test, $30 for a semester final.

Once past the shock, and as an aside, I can’t quite fathom the economics.  Presumably the only people who see these ads are the students, and I can’t imagine that anxiety about an algebra test would be a good vehicle for an ad for a local dentist.  But I admire the initiative, sort of.