Indian rupee tumbled to a historic low on Tuesday as it dipped past the 90-a-US-dollar level in intraday trade. According to PTI, the rupee closed at an all-time low of 89.95 on Tuesday, 42 paise lower than Monday's close of 89.53 against US dollar. Foreign fund outflows from equities and lingering India-US trade deal uncertainty are keeping investor sentiment fragile.