Case Study 38: Technology. Global.Dahui Lian, a Shanghai official with whom you have met on several past visits to China, is planning to come to the United States. Through your visits and subsequent e- mail exchanges, you have been successful in building a relationship with Dahui. Because of that relationship, he has asked for information about gratuity customs (tipping) in the United States. Use print and Internet resources to gather information about tipping in restaurants, airports, hotels, and other situations he might encounter. Write a message summarizing this information and e-mail it to him. (5M)