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A college student expects to earn at least $1000 in interest

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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
A college student expects to earn at least $1000 in interest
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