The rupee strengthened by another 3 paise to mark its seven-week high of 73.57 against the US dollar on Wednesday, with sustained foreign fund inflows and firming domestic equities lending support. Traders said weakening of the American currency in the overseas market also favoured the local unit. At the interbank forex market, the domestic unit opened at 73.58 against the US dollar and witnessed an intra-day high of 73.49 and a low of 73.61.The local unit finally closed at 73.57 against the American currency, registering a rise of 3 paise - its highest level since October 22.