题目：
利民商店出售一种商品原价为a，有如下几种方案：
（1）先提价10%，再降价10%；
（2）先降价10%，再提价10%；
（3）先提价20%，再降价20%．
问用这三种方案调价的结果是否一样？最后是不是都恢复了原价？
答案：
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A
利民商店出售一种商品原价为a，有如下几种方案： （1）先提价10%，再降价10%
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题型：解答题
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