A day after the rupee hit an all-time low and breached the 77 per dollar mark, the Reserve Bank of India (RBI) on Tuesday intervened heavily across foreign exchange markets — spot, futures, and off-shore — which stopped the rupee from going past the 77.50 per dollar level, currency dealers said. The Indian currency opened at 77.29 per dollar after closing at 77.46 on Monday. State-run banks sold dollars heavily, on behalf of the central bank, at 77.42 levels, the dealers said. The rupee ended the day 77.33 per dollar, up 14 paise from the previous close, after touching the day’s low of 77.45. “The RBI protected the rupee, preventing it from hitting 77.50 levels. We have seen dollar selling in those levels,” said Amit Pabari, managing director, CR Forex.. In a Business Standard poll on Monday, most participants expected the rupee to breach the 78 per dollar mark by the end of this month, while some projected the rupee to breach 79 per dollar levels by the end of the quarter. “There wa