Dow Jones Industrial Average Tumbles 200 Points After Yuan Extends Slide

UPDATE: 12 p.m. EDT The Dow Jones Industrial Average hit a 2015 low in midday trading Wednesday, erasing gains for the year after the yuan extended losses against the U.S. dollar as concerns grow about global growth. China is an important source of world demand and the measures the country is taking is causing investors to question how weak the world's second largest economy is. Market professionals are also concerned whether there will be tepid demand from the country moving forward as China is...