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标题: [求助]一道数学题目55 [打印本页]

作者: jasminer 时间: 2009-9-13 09:17 标题: [求助]一道数学题目55

After paying a 10% tax on all income over $3,000 , a person had a net income of $12,000. What was the income before taxes?

A 13300 B 13000 C 12900 D 10000 E 9000

作者: xiaoxiugirl 时间: 2009-9-13 20:52

12000=x-(x-3000)0.1

x=13000

作者: jasminer 时间: 2009-9-16 06:39

哈哈谢谢

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