Q10:
If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit, represented as I = 1000 {(1 + r/100)n – 1}, and the annual interest rate is r percent, is r > 8 percent?
(1) The deposit earns a total of $210 in interest in the first 2 years.
(2) (1 + r/100)2 > 1.15
这道题选D,是不是因为R>8%,若是R>8,条件2就错了,因为,r=7.9, 也会有(1 + r/100)2 > 1.15
这种题目不用硬算的,只要看能不能回答结果就好了,能回答的就是对的,不能的就是错的
第一个是个固定的,肯定能算出来R,所以不管怎么样都是可以的
第二个是不等式,要算一下R的范围才行
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