TTGWD13不明白为什么是D,谢谢拉

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

不明白为什么是D,谢谢拉