Thank you very much!!!~~~不懂的数学题(用文字写过程)
来源:百度知道 编辑:UC知道 时间:2024/06/14 15:31:47
一商店把货物按标价的9折出售,仍可获利20%,如果该货物进价为每件21元,则每件的标价为多少元?
标价x
0,9x=(1+20%)*21
获利20%,说明利润就是20%*21=10.2元。所以标价的90%就是进价加利润即21+10.2=31.2元。所以进价=31.2/90%=34.7元
解:设每件标价x元,由题意得:
0.9x-21=21×0.2
0.9x=4.2+21
0.9x=25.2
x=28
答:每件的标价为28元。
21*(1+20%)/0.9=28元
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