这题的答案是D?我认为不对。根据(2)的条件r应该可以<8吧,例如7.96啥的。
到底是选A还是D呢?
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 $
(2) (1 + r/100)2 > 1.15
A?
(1+x)**2=1+2x+x**2>1.15
2x+x**2>0.15 but 2*0.08=0.16 so.. can't decide x>0.08 or not.
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