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

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

TOP

I GOT IT~!
THX

TOP

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

TOP

呃 还是没太明白~~!
是(1+4%)的平方?

TOP

就是说年利率是8%,每半年复合一次,一年就是(1+4%)^2

TOP

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