Miguel has decided to take a course at the regional college that can help him get a promotion at his job. The course begins at 4 pm and ends at 8 pm on 20 Mondays. Miguel normally works until 5pm every day, but due to traffic, to get to school, he will need to leave at 3:30 pm on school days. He currently earns $ 19.50 per hour. If the class meets 20 times, what is its total opportunity cost?