A: This system took the total exchange value of the NT dollar against the US dollar from the previous day and divided it by the total volume to get the average number to serve as the current day's center price.
答：這個制度就是以前一日新台幣兌美元的總成交值除以總成交量，求出的平均數，做為當日匯率的中心價位；每天以這個中心價位，上下百分之二．二五，做為漲跌幅限制。