David O’Bannon offers real estate training classes. Each of his classes has 3 hours of instruction and is offered in hotel rooms that hold 25 seats. David believes his course is great, so he offers any unsatisfied student the opportunity to take the class 1 more time. A student taking the class for the second time occupies a seat that cannot be used by another student. 75 percent of students take the class once and 25 percent choose the option to take it twice. What is David’s capacity to “graduate” students per 3-hour session?