We usually deal on a 20% trade discount basis with an additional quantity discount for orders over 1000 units.
我们通常给予20%的商业折扣,外加订货1000件以上的数量折扣。
who is which depending on whether the customer's account is in credit or is overdrawn.
究竟谁是债务人谁是债权人,要看储户的账户是有结余还是透支。