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王小奇在座位上百思不得其解,数学老师为什么把自己的答案给判了个“错”呢?王小奇的答案究竟错在哪里?让我们来看题目:一种商品连续两次降价,最终下降了19%,那么平均每次降价的百分率是多少?
Wang Xiaoqi was puzzled in his seat. Why did mathematics teacher judge his answer to “wrong”? Where did Wang Xiaoqi’s answer go wrong? Let’s look at the topic: A commodity was cut twice in price, The final drop was 19%. What is the average percentage of each price cut?