The daily reference exchange rate at 23,182 VND per USD on July 1 (Photo: VNA) Hanoi (VNA) - The State Bank of Vietnam set the daily reference exchange rate at 23,182 VND per USD on July 1, up 4 VND from the previous day. With the current trading band of +/- 3 percent, the ceiling rate applied to commercial bank during the day is 23,877 VND/USD and the floor rate 22,468 VND/USD. The rates listed at major commercial banks saw marginal fluctuations. At 8:20 am, the rates at Vietcombank stood at 22,890 VND/USD (buying) and 23,120 VND/USD (selling), unchanged from June 30. BIDV also kept both rates stable,