问题
单项选择题
A merchant purchased a jacket for $60 and then determined a selling price that equalled the purchase price of the jacket plus a markup that was 25 percent of the selling price. During a sale, the merchant discounted the selling price by 20 percent and sold the jacket. What was the merchant’s gross profit on this sale ？（）
A．$0
B．$3
C．$4
D．$12
E．$15
答案
参考答案：C
解析：
设该商人所定的销售价格为x美元，则此价格为购买价格加上销售价格x的25%，根据题意可得到如下方程：
x=60+x·25%
→x=80美元，所以毛利润为：
80×(1-20%)-60=4美元