标题: OG12th PS 78 [打印本页]

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作者: jessicasonia    时间: 2012-3-13 07:14     标题: OG12th PS 78

Leona bought a 1-year, $10,000 certificate of deposit that paid interest at an annual rate of 8% compunded semiannually. What was the total amount of interest paid on this certificate at maturity?
A $10,464
B $      864
C $     816
D $     800
E $     480

主要是不太理解boldface部分 希望NN给我解答~！
THX~!!!

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作者: hjbb1027    时间: 2012-3-13 20:12

就是说年利率是8%，每半年复合一次，一年就是(1+4%)^2

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作者: jessicasonia    时间: 2012-3-15 06:57

呃 还是没太明白~~！
是(1+4%)的平方?

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作者: hjbb1027    时间: 2012-3-15 19:58

相当于半年的compound rate是4%，一年之后就乘以（1+4%）^2,两年之后是（1+4%）^4

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作者: jessicasonia    时间: 2012-3-16 06:56

I GOT IT~!
THX

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作者: mandybabay    时间: 2012-3-26 20:06

A = P* (1+ r/n)^(n/t).

P = 10,000
r = 0.08 (8%)
n = 2 (semiannually = 2, quarterly = 4)
t = 1 (one year)

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