KARACHI - Dollar marginally dipped against rupee in inter bank market on Tuesday, it was traded at lowest rate of Rs 98.75.  According to the data provided by the Forex Association of Pakistan, dollar traded at lowest rate of Rs 98.75 and highest rate of Rs 98.85 in inter bank market. The US currency traded at minimum price of Rs 98.70 and maximum price of Rs 98.90 in open market.