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【OG20-P175-191题】
If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately 70/r years. If Pat's parents invested $5,000 in a long-term bond that pays 8 percent interest, compounded annually, what will be the approximate total amount of the investment 18 years later, when Pat’s ready for college?
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投资收益经过70/r年后会double，当r=8时，说明过（70/8）年，收益会由5000变为10000, 在18年中会double两次，第一次由5000变10000，第二次由10000变20000
题目讨论 （5条评论）
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499685skw
问题其实在问，有几个70/r...
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2022-09-11 18:08:55
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快乐小多
离离原上普……看懂题之后真的太简单 就是看不懂55555
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2021-10-25 18:12:41
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亲亲的清清HQQ
为什么当R=8时，就会double？
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2019-09-15 12:43:46
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emily666回复亲亲的清清HQQ
题目中提到过70/8会翻倍，18年经历两次70/8年
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2020-03-12 22:09:02
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166997vaoj回复亲亲的清清HQQ
不管r等于多少 在70/r年的时候都会double
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2021-12-11 19:33:29
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Adam贾
this question we need to pay attention to the compounded annually,r interest represents the things that mention later ,8%,so after 70/8 years the investment will double,and if you invest approximately $5000,this period will increase to $10000,and 18 include two 8%,so the investment will double again ,the result is 20000.
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2018-10-19 16:27:04
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默默
复利计算的话，第二轮是在10000的基础上
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2018-04-21 05:34:53
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默默回复默默
70/r会翻两番
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2018-05-09 05:59:59
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