According to the class type. Official website, an educational institution of Luohe Xinbo, shows that the charging standard of Luohe Xinbo Education is 29 yuan/class hour for small classes (10 or less), 25 yuan/class hour for middle classes (10 to 35 students) and 2 1 yuan/class hour for large classes (more than 35 students), and the standard class hour is 45 minutes. Therefore, Luohe Xinbo Education is charged according to the class type.