KARACHI  :Dollar still strong against rupee as it traded at Rs 106.40 in cash free/open market on Tuesday. According to the data provided by the Forex Association of Pakistan, US dollar traded at minimum price of Rs 105.55 and maximum price of Rs 105.60 in inter-bank while the American dollar traded at the lowest price of Rs 106.20 and highest price of Rs 106.40 in cash free market.