1美元= CNY(6.7010-0.0100)/(6.7040-0.0050)= 6.6910/6.6990
港幣1 = CNY(6.6910/7.8360)/(6.6990/7.8260)= 0.8539/0.8560
三個月後,出口商654.38港幣+0萬元可兌換人民幣85.39萬元。