The National Bank appeared in the market with auction sale of the euro at 11 UAH/EUR. On July 30, interbank also closed with currency quotations down to 8.005-8.052 UAH/USD and 11.257-11.326 UAH/EUR.  The NBU appeared in the market with a rate of 7.73-7.75 UAH/USD. Friday's average purchase rate of the cash US dollar at Ukrainian banks, compared to Thursday's, reduced by UAH 0.0346 to UAH 7.9466.  The sale rate of the US dollar fell by UAH 0.0388 to UAH 8.1248. The average purchase rate of the euro reduced by UAH 0.0403 to UAH 11.1862, and sale rate by UAH 0.0676 to UAH 11.5172. The National Bank strengthened the official hryvnia for July 31 to 7.698 UAH/USD and 10.817999 UAH/EUR.