Mumbai, Sept. 17 -- The Indian rupee appreciated 25 paise to close at 87.84 (provisional) against US dollar on Wednesday, tracking a positive trend in domestic equities and supported by optimism over US-India trade negotiations. Indian shares ended higher for a second consecutive session on Wednesday after India and the U.S. agreed to speed up talks on a bilateral trade. After a high-level official meeting, it was decided to intensify efforts to achieve early conclusion of a mutually beneficial Trade Agreement," according to a statement issued by the Commerce and Industry Ministry. The benchmark S&P/BSE Sensex ended the session up 313.02 points, or 0.38 percent, at 82,693.71, extending gains for a second day. The broader NSE Nifty index c...