Dr. Falk is a dentist who performs two basic procedures: filling cavities and whitening teeth. Falk charges $50 per cavity filled, a process that takes him 15 minutes per tooth and requires no help or materials. For tooth whitening, a process requiring 30 minutes, Falk charges $150 net of materials. Again, no help is required. Is anything puzzling about Falk's pricing pattern? Explain your answer.