在一次生意过程中,顾客购买第一件衣服是x美元,此后顾客每增加一件都比第一件少z美元.例如：第二件衣服的价格是x-z美元.以下哪一个表示的是顾客购买n件衣服需要支付的金额?
答案：x+(n-1)*(x-z)
英语翻译During a sale,a customer can buy one shirt for x dollars
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