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标题: 请教nn一道数学题...谢谢:) [打印本页]

作者: lizhihuantu 时间: 2007-2-4 07:46 标题: 请教nn一道数学题...谢谢:)

A family made a down payment of$ 75 and borrowed the balance on a set of encyclopedias that cost $400.The balance with interest was paid in 23 monthly payments of $16 each and a final payment of $9.The amount of interest paid was what percent of the amount borrowed?
没理解题目.......答案是16%

作者: trifling 时间: 2007-2-4 14:38

[16*23-(400-75-9)]/(400-75)=16%

作者: lizhihuantu 时间: 2007-2-4 19:15

能翻译下中文意思不????

主要是没理解题目意思..............谢谢

作者: xianwhartons 时间: 2007-2-5 06:58

題目問利息/借的錢=多少ratio
這家庭只自己付頭期款75,其他全是借的.所以分母放400-75. The balance with

interest was paid in 23 monthly payments of $16 each and a final payment

of $9.全部付的錢=16*23.要只求利息就要-(400-75-9)

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