A minority business certification has helped a local car dealer see a surge in business from the state. Centerville-based Bob Ross Auto Group, certified as a minority-owned business, has seen growing sales from states and public entities. Ohio has established a goal that its organizations do 15 percent of their business with minority-owned companies. From January to July 2014, Bob Ross sold 289 vehicles to state organizations worth $7.4 million in sales, triple from the same period in 2011, when…