[問題]GWD 13-14

[puthing]

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)}^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.

ans:(D)

請問條件一為什麼可以推得?

D(t) = 10,000 {1+(r/100)}^t = 11000 不是有兩個未知數嗎?

[puthing]

糟糕.....重複貼了 ><"

怎麼刪除.........