With the current trading band of + /-3 percent, the ceiling rate applicable to commercial banks during the day is 23,906 VND/USD and the floor rate 22,513 VND/USD The opening-hour rates at commercial banks saw sharp increases. At 8:35am, Vietcombank listed the buying rate at 22,950 VND/USD, up 280 VND, and the selling rate at 23,220 VND/USD, up 270 VND from December 6. BIDV also added 260 VND to both rates, listing at 22,960 VND/USD (buying) and 23,200 VND/USD (selling)./.