Mumbai: In volatile trade, the rupee strengthened for the second straight day on Monday closing 23 paise higher at 55.52 a dollar on robust capital inflows and strong stock markets amid exporters selling the US currency.

At the Interbank Foreign Exchange (Forex) market, the domestic unit resumed sharply higher at 55.35 a dollar from last Friday’s close of 55.75 and improved further to a one-week intra-day high of 55.24.