Thank you very much!~~~不懂的数学题(用文字写过程)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?

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Thank you very much!~~~不懂的数学题(用文字写过程)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?
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Thank you very much!~~~不懂的数学题(用文字写过程)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?
Thank you very much!~~~不懂的数学题(用文字写过程)
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?

Thank you very much!~~~不懂的数学题(用文字写过程)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

21*(1+20%)/0.9=28元

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

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。

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