$A rises after rates left unchanged THE Australian dollar has gained almost a quarter of a US cent after the Reserve Bank left the cash rate unchanged at 2.5 per cent at its Melbourne Cup day board meeting. THE currency was worth 87.22 US cents at 1435 AEDT, up from 86.98 US cents shortly before the RBA's decision was announced. The Australian dollar hit a one-month low of 86.46 US cents in morning trade, due partly to an upward revision to the September unemployment rate by the Australian Bureau of Statistics.