在线求一道英语数学题.Compound Interest.
问题描述：
在线求一道英语数学题.Compound Interest.
A fortunate algebra student wants to invest $1,000,000 in a tax-free fund.If she hopes to double her investment in 8 years,What interest rate mush she seek if her account is compounded monthly?Give your answer in percent and correct to the nearest decimal place.
现在我知道答案 r约等于 8.7%
不过我不会算..这个公式对吗?
2x1,000,000=1,000,000(1+r/12)^8x12.
怎么计算呢?
答
compounded 表示利息按复利计算 要用指数公式
设年复利为r 则e^8r=2 推出r=8.7%