11. A restaurant manager is considering keeping the business open two hours later. He estimates his labor cost for the additional two hours to be $287 and the cost for additional utilities and other expenses to be $71. If the variable rate (covering all other variable expenses) for the restaurant is 0.614, how much additional business in sales does the manager need to bring in during those two extra hours to break even? 12. What are the four classications of marketing approaches? 13. List four examples of external marketing and four examples of internal marketing. Describe the difference between internal and external marketing. 14. List three ways in which a POS system helps a manager to drive revenue and three ways in which it helps a manager to control costs