The rupee today strengthened by 90 paise to trade at four-week high of 62.58 against the dollar at the Interbank Foreign Exchange market on increased capital inflows and dollar selling by exporters. The rupee had settled at 63.48 against the dollar on Friday, up marginally by two paise over previous day's close.Traders said apart from selling of the American currency by exporters and banks, dollar's weakness against other overseas currencies also supported the rupee.