求助一道GWD~感觉答案有误~

owen870930

Q14:

$10,000 is deposited in a certain account that pays r percent annual interest compounded annually, the amount D(t), in dollars, that the deposit will grow to in t years is given by D(t) = 10,000 {1+(r/100)}的t次方.  What amount will the deposit grow to in 3 years?

(1)  D(t) = 11,000

(2)  r =10



A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案给我的是D~可是根据条件1只能算出{1+(r/100)}的t次方 等于1.1~算不出R等于多少？个人感觉选 B~求证

Rainbeauty

我也觉得是B。。。

emilygelert

是d，因为a虽然理论上不能算出R，但是只要你带进去算，就会发现，{1+(r/100)}的t次方为1.1，1.1开放没有有理数，t只能是1， 所以得出r。
不用太谢谢我

jesmine

题目不是告诉你In three years了吗？那t=3啊···