一件商品打八折出售现价比原价便宜了百分之几,售价400元原价是多少元

列式

400/0.8=500(元)
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第1个回答  2011-12-27
便宜了20%(1-80%)=20%,原价是500,400/0.8=500
第2个回答  2011-12-26
400/0.8=500(元)本回答被提问者采纳
第3个回答  2011-12-26
1-0.8=0.2=20%
400除以80%=500(元)
第4个回答  2012-02-26
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