** Shares of Australia's Guzman y Gomez rise as much as 7.8% to record high of A$41.5
** Mexican themed fast-food chain to be part of S&P/ASX 200 from Sept. 23
** Stock has risen 38.3% since its trading debut on June 20
** Coal-miner Yancoal Australia and explorer Metals Acquisition will also join ASX 200
(Reporting by Rishav Chatterjee in Bengaluru)
((Rishav.Chatterjee@thomsonreuters.com;))