a movie theatre charges $4 per movie and the fifth movie is free. how much are you actually paying per movie

You have to average out the total amount you pay by how many movies you see. For this deal, you must spend $16 (4 movies x $4) to get a fifth movie free. So, you are essentially spending $16 for 5 movies. To figure out how much the cost is per movie, divide the total cost by number of movies seen. $16/5 movies = $3.20 per movie