Domestic equity benchmarks were trading lower on Friday with 30-share BSE Sensex falling over 500 points and NSE Nifty trading below 18,500. The Nifty sectoral indices were trading mixed with Nifty Metal dropping 0.61% while Nifty FMCG rose 0.54%. The volatility Index India VIX was trading 1.88% higher. NSE 52-week…