请NN指点一道数学题！！！

tim_zyb

$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)}^t.  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.

答案是D 我对（1）不太明白 这是直接给出答案了吗 还是要把t=3代进去算出r ?不理解啊……

tim_zyb

自己up下！

喝咖啡的狼

我觉得既然题目给定条件 D(t) = 11,000，那么无论对 t = 任何数都成立。

所以 t =3 也是11000，不用想得太复杂吧。。

furaolove

直接给出答案？？

tim_zyb

莫非还真是直接给答案……？不像GMAC风格啊……

Hi_Cynthia

我来说说吧
无论

(1)
              D(t) = 11,000

(2)
              r =10

任何一个条件都是要得到r是多少，不用算r，但只要有条件1，r就已知，公式就已知了，那必然能求D(3)
条件2同样，只不过直接告诉r=10了

keitaku

莫非 条件（1）的意思是 D(t)=D(1)   ？