Market opens on a Positive note; Nifty heads towards 8,300 levels: The benchmark indices have opened the week's proceedings on a healthy note despite the mixed set of cues from global front. At 9:20 am, the Sensex was at 27,448, higher by 124 points or 0.5% and the Nifty was just shy of the 8300 mark at 8,294, up 31 points. One would have to see if the the Nifty builds on its early gains or re-tests its crucial psychological level of 8250 in trade today. The Indian rupee opened with marginal gains of 6 paise at 63.45 per dollar on Monday versus 63.51 Friday. The dollar falls to a three-month low against the euro, as disappointing data on US domestic factory activity and consumer sentiment spurred doubts about the recovery in the US. The dollar index slips to the 93 levels.