Question

请教一道数学题。。。

A college student expects to earn at least $1000 in interest on an initial invesrment of $20000.If the money is invested for one year at interest compounded quarterly ,what is the least annual interest rate that would achieve the goal.
Answer:20000(1+r/400)^4>=1.05 得出r=4.91
能帮忙翻译成中文吗，解释一下过程，谢谢了。

Answer 1

一个大学生想要通过用初始投资20000美元来赚取利息1000美元。如果这笔钱投资为1年，每季复利，能够实现这一目标的最小年利率是多少？
答案是
20000×(1+r/400)×4≥ 1.05 得出r≥4.91
即需要的最小年利率为5

Answer 2

一个大学生想要通过用初始投资20,000美元来赚取利息1,000美元。如果这笔钱投资为一年，每季复利，能够实现这一目标的最小年利率是多少？

Answer 3

百度在线翻译

Answer 4

E