The TDK tape company services 1,000 audio stores throughout the United States. Each store is called on

Question:

The TDK tape company services 1,000 audio stores throughout the United States. Each store is called on 12 times a year, and the average sales call lasts 30 minutes. Assuming a salesperson works 40 hours a week, 50 weeks a year, and devotes 75 percent of the time to actual selling, how many salespeople does TDK need?