KARACHI - Rupee took strength against dollar in money market on Thursday, it was traded lowest rate of Rs 100.55 in cash free market. According to data provided by the Forex Association of Pakistan, dollar traded at minimum rate of Rs 100.55 and maximum rate of Rs 100.75 in cash free market while it was traded at lowest rate of Rs 100.50 and highest rate of Rs 100.55 in inter bank.