NEW : The St. Xavier 's tour Humayun 's Tomb . The president celebrates Barack Obama with local students . Diwali is a festival of lights . Sunday , the president unveiled about $ 10 billion in contracts for India exports to U.S. .
NEW : The Obamas tour Humayun 's Tomb . The president celebrates Diwali with local students . Diwali is a festival of lights . A day earlier , the president unveiled about $ 10 billion in contracts for U.S. exports to India .