7.3 A text driver pays $200 per day for taxi rental, $2 per day for auto insurance and $5 per day for business licenses. Gas and maintenance costs are $0.2 per mile. The taxi driver charges $0.6 per mile and travels 30 miles per day without any customers. a. How many miles must the driver carry customers to break even, without any tips? b. How may miles must the driver carry customers to break even if customers give him average $50 tips per day