General Motors Co on Monday showed its Chevrolet Bolt concept car with an electric driving range of more than 200 miles and a $30,000 price tag, offering a view into where the U.S. automaker is pushing in development of electric vehicles (EV). The all-electric Bolt is a concept car not currently slated for production, but Chief Executive Officer Mary Barra said the company is committed to developing an affordable long-range EV, and GM said they could develop the car in as little as 18 months. “This is a real game changer,” Barra told reporters at the media preview at the...