GMAT一道数学题$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 depos

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GMAT一道数学题
$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.

我认为是选B （1）的式子只给了D(t)的值 而这个式子无法求得满足该式的r和t的值 题目规定只有r的值是定量 因为年利率不变 不能算出r的话 便不能贸然带入题目中给的t=3 不能确定值的话便不充足
而（2）已经给定了定量r的值 直接便可带入原式r和t的值 便可求出题目所需答案 即确定值13310
还有你那个t应该是平方吧 打错了 以上

选c r相当于利息吧（可以这么看） 经过三年1000刀变1100刀 利率不明是不行的。利率不清楚1100刀可能达不到

我觉得是选B，就是求D(3)吧

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