The college hosts an adult educational program for local businesses. Student tuition is $150 per semester credit hour. The companies that collaborate with the college supplement school revenue by $100 per semester credit hour for each student. Labor costs are $4,000 per class (independent of student number), material costs are $20 per student per class, and overhead costs are $22,500 per class (independent of student number). Answer the following questions, Q1~Q3. Q1: The instructor works an average of 14 hours per week for 15 weeks for a 3-credit class of 40 students. So, if there are 40 students in the class, what is the labor productivity, where output is gross revenue and input is labor hour? You need to show your calculation (e.g., Excel formulas) besides the answer.