加解釋and完整列式
更新1:
兩位的列式可否再更加詳細呢?
s1 math per cent 難題!!
2011-12-30 5:21 am
The marked price of a pair of shoes is $300.By what percentage should the marked price increase to maintain the selling price at $300 after giving a discount 20%?
加解釋and完整列式
加解釋and完整列式
回答 (2)
2011-12-30 5:55 am
✔ 最佳答案
original marked price = 300new marked price = 300(1+R)
new marked price x (1 - 20%) = 300
300(1+R) x (0.8) = 300
1 + R = 5/4
R = 1/4 = 25%
2011-12-30 5:54 am
Let the required percentage is x%
300 * (1 + x%) * (1 - 20%) = 300
1 + x% = 1.25
x = 25
the required percentage is 25%
300 * (1 + x%) * (1 - 20%) = 300
1 + x% = 1.25
x = 25
the required percentage is 25%
收錄日期: 2021-04-26 19:17:50
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https://hk.answers.yahoo.com/question/index?qid=20111229000051KK00982