ISLAMABAD - Exchange rate of Pak rupee weakened by Rs 1.21 against the US dollar in the interbank trading on Friday and closed at Rs 209.95 against the previous day’s closing of Rs 208.74. According to the Forex Association of Pakistan (FAP), the buying and selling rates of dollar in the open market were recorded at Rs 211 and Rs 213 respectively. The price of Euro appreciated by Rs 1.76 and closed at Rs 221.33 against the previous day’s closing of Rs 219.58.