Using his TightWad(R) database, Stu's MileageMiser has developed a new GPS based service to certify drivers for insurance discounts. He tracks their speeds, locations, and braking activity and delivers reports to insurance companies. January 1, 2009 he had 5,300 paying customers. Of that group, a year later, 3,200 were still customers. He spent $15,900 on programs designed to keep current customers happy and $35,000 on marketing to acquire new customers. His total number of customers on January 1, 2010 was 7,500. His revenue per customer is $31 per year and variable costs before marketing per customer are $8 per year. How many new customers did Stu acquire in 2009? 0 customers