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Which customer has highest gross margin ratio? Airport Bikes Alster Cycling Bavaria Bikes Beantown Bikes Big Apple Bikes Capital Bikes Cruiser Bikes DC Bikes Drahtesel Fahrpott Furniture City Bikes Motown Bikes Neckarrad Northwest Bikes Ostseerad Peachtree Bikes Northwest Bikes Ostseerad Peachtree Bikes Philly Bikes Rdlelland Red Light Bikes Rocky Mountain Bikes Windy City Bikes Silicon Valley Bikes SoCal Bikes Velodrom Which customer has highest gross margin ratio? Airport Bikes Alster Cycling Bavaria Bikes Beantown Bikes Big Apple Bikes Capital Bikes Cruiser Bikes DC Bikes Drahtesel Fahrpott Furniture City Bikes Motown Bikes Neckarrad Northwest Bikes Ostseerad Peachtree Bikes Northwest Bikes Ostseerad Peachtree Bikes Philly Bikes Rdlelland Red Light Bikes Rocky Mountain Bikes Windy City Bikes Silicon Valley Bikes SoCal Bikes Velodrom