Bengaluru: India’s factory activity unexpectedly expanded in August, snapping back from a contraction the previous month, as disruptions stemming from confusion over a new national sales tax eased, a business survey showed on Friday. The Nikkei/Markit Manufacturing Purchasing Managers’ Index rose more than three points to 51.2 in August from 47.9 in July, beating the median economist forecast of 49.3 …