SAN FRANCISCO - DECEMBER 03: Waiter Alexander Alioto prepares to serve lunch to customers at Alioto's Seafood Restaurant December 3, 2008 in San Francisco, California. A report by The Institute for Supply Management says that its services sector index dropped in November to 37.3, down from 44.4 in October as the service industry struggles through the weak economy. (Photo by Justin Sullivan/Getty Images)
Lisa is tired of paying for her friend’s lunch. How should she address is time for her to pay up?