MOSCOW, July 30. /TASS/. The Bank of Russia set the official dollar rate at 81.8347 rubles for July 31, down 39 kopecks against the previous indicator.

The official euro rate was lowered by five kopecks to 94.9514 rubles. The official yuan rate is fixed at 11.3683 rubles, down six kopecks against the prior figure.

The Central Bank fixes official dollar and euro rates against the ruble on the basis of reports of banks on results of transactions in the over-the-counter currency market.